As a Chinese, do you remember the atrocities you did to the Chinese people? You might not remember, but my grandparents remember it vividly. Now the question is, what has Chinese people done to you so far to have you make such a statement?
As a Chinese also, do you realize that the person you're talking to has done nothing to the Chinese people?
His ancestors (possibly, and possibly not), under a completely different regime that is wholly unlike that which governs Japan today, committed atrocities against your ancestors.
He does not remember, because he was not alive to witness or commit said atrocities, or indeed have the tiniest sliver of influence on the regime that did so. You are suggesting moral culpability where there cannot, in any reasonable mind, be any. He has done nothing. He is not his ancestors, and shares exactly zero moral responsibility for their actions when he wasn't even alive.
Other the other hand, I have met many fellow Chinese who have expressed, without a sliver of irony, that the blood spilled 7 decades ago needs to be repaid. Yes, I've had people suggest this to my face seriously. They suggest that committing the same atrocities back against the Japanese is somehow just.
There is plenty of hate to go around, from everyone. The Chinese people aren't saints, and to believe that only the Japanese are capable of such atrocities is the exact hubris needed to lead the world back down that dark path again.
This is a geopolitical conflict between two major powers. Nothing more, nothing less. Any nationalistic cheerleading is strictly playing to the interests of politicians, not any nobler concept like ethnicity, race, or nation.
"He" did not commit war crimes. His grandparents or grandparent's relatives might have. Please don't equate crimes committed in past generations to crimes committed by this generation.
Now, the recent problem has nothing to do with government structures. It's simply a case of geo-political conflict of interests. South Korea is a full-fledged democracy, if they were enough to avoid any conflicts, there wouldn't be sovereignty dispute on the Liancourt Rocks.
Japan and China are not in a Cold War. That simply wouldn't make sense since no one has threatened anyone with total annihilation under nuclear weapons yet. There's also a zero chance that China will invade the Japanese homeland, never happened, never will happen. It's more likely that they'll take Diaoyu/Senkaku by force if they have to. Diaoyu/Senkaku is virtually indefensible and uninhabitable pieces of rocks, so I highly doubt that the Chinese will do that unless they can control Taiwan and possibly Okinawa - impossible and unlikely task.
That present-day China is a totalitarian state is just a statement of fact about its government, not an opinion or a judgement about the Chinese people. (And personally, I really wish them the best in changing that situation.)
But, the Chinese government being what it is, you have to consider it when deciding to live or do business here.
Japan was indeed once a dangerous and belligerent actor on the world stage (Nanjing massacre, sex slave camps, attempted genocide, and lots more evil stuff.) However, Japan's military was then thoroughly annihilated, its cities were nuked, its capital was burned to the ground, and most of its leaders were put to death. Throw in a new constitution protecting human rights and the creation of a functioning democratic government, and we end up with an extremely different Japan today, 67 years later.
And (in my opinion), today's Japan is a really great place to live and to do almost any kind of technology-related business.
So I'm not making any statement absolving Japan's historical atrocities (incidentally, I'm American, and both my grandfathers fought against Japan in WWII). But I also don't think they are all that relevant to the times we live in. The perpetrators are now all dead, and the empire they fought for was thoroughly dismantled before I was born.
On the other hand, I'm a lot more interested in what's happening right now. And as far as I can see, Japan doesn't threaten its neighbors or the stability of the region in any way. China, on the other hand, with with its recent threats of military action against Japan, almost daily maritime incursions into Japanese territory, support of North Korea, and so forth, seems extremely unhelpful. (Plus, that whole totalitarianism thing... historically, seems to usually end badly.)
So as a practical matter, I think that the interests of regional stability and peaceful business pursuits would probably be better served if Japan had a military more in line with its economic power, rather than relying on the protection of a country across the ocean, most of whose citizens couldn't find Japan on a map.
Technically, China has never issued any formal threats of using force against Japan(google that one), North Korea is as much as PITA for China as well as the rest of the world. The only reason DPRK is still here is because China doesn't want any massive influx of refugees (North Koreans can't cross into the South directly because of the landmines in the DMZ).
As much as I hate the current regime in China, I don't see them being a threat to world peace. The fear of totalitarian regimes is pretty much a BS notion manufactured by the American media. A totalitarian leader is only a threat to world peace under the following conditions: 1) He's extremely charismatic. 2) His country is running out of resources. 3) He believes he is under a great external threat.
China hasn't seen a charismatic leader since Mao, tho running out of resources, it is actively addressing it by developing renewable resources. There is also no country openly hostile to China, including Japan.
I don't have anything against Japan increasing meagerly its military budget, or even repeal Article 9. It's fully their right to do so as long as they are not hostile. But saying Japan is not potentially dangerous is not entirely correct. Japan is still mostly ruled by a right wing aristocracy that have extremely close relationship with the government officials during WWII. Economy has stagnated and arguable steadily declining since the 90s. It has almost no natural resources for an industrialized nation to speak of and it believes it is under constant thread from North Korea. All that it takes is a charismatic Japanese leader and a crappy Chinese defense to see Japan aggression rise up again.
After seeing how Japanese government handled Fukushima accident, I as a Korean don't feel very safe with them wanting to play with a bigger gun. If Japanese government doesn't or can't take care of its own people, how do I believe it will care so much about world peace?
What happened post WWI to the end of WWII by past Japanese that no longer run the country was an atrocity to say the least. As others mentioned, those people are no longer governing the country and their ideas are not carried by the majority.
However, what is somewhat alarming is how Japan went from being a civilized country that treated prisoners humanely[1] in WWI with Germans they captured to what happened following The War. Although humans can be brutal, it still shocks me whenever I see examples of how a population can do almost a 180 (regardless of country [not trying to pick on Japan, they were just the discussion topic]) in such a short time. Makes one pause to think how a cultured, intelligent population can go astray so quickly under the wrong leadership.
