Markets are just a tool. Entirely unregulated markets exhibit some undesirable properties. Society, through government, has every right to aim to diminish the ill effects of these undesired properties. But it also behooves society to be careful in how it regulates, in order to avoid diminishing the usefulness of this tool. It's a balance. This is not as sexy or simple in principle as either extreme, but it's the right answer.

This is one of those cases where regulation makes sense. I think regulations aimed at improving information symmetry are some of the best. They are fairly low impact; maybe they stomp on an arbitrage opportunity, but they don't limit the solution space nearly as much as regulations that simply proscribe what you can and can't do, for instance.

Basically: the "hard libertarians and anarcho-capitalists" are just wrong. But if they were to rebut with a take down of state controlled economies, I would definitely agree with them about that. The trick is to strike a good balance.