Chuck "SFDebris" Sonnenburg made a great point about this in his review of Carpenter's Prince of Darkness: time travel is the ultimate gamble, because you don't know and can't control how it is going to come out. It's the thing you only do when literally anything else is preferable to the status quo. I don't think the situation of humanity at the end of Episode 2 meets that standard. It's bad, sure! But there are countably infinite ways in which it could be much worse.
