Why coercion is an essential and beneficial element of maximal-capitalist society.

No, because states created the barriers that makes these protests artificially profitable.

Remember my sentence: When has large-scale coercion by private entities been worthwhile without state barriers that made it artificially profitable?

We can also scratch ‘large-scale’ from that sentence: No coercion by private entities has ever been worthwhile without state barriers that made it artificially profitable. EmperorNero’s 2nd law. (The first one is that there is no such thing as a rich socialist country.)

By “statists” do you mean people who employ coercion? Because usually it means “people who support a strong state”, and that wouldn’t make sense in an anarchist society.

Sure there is, competition. That would be the old debate whether free markets naturally lead to monopolies. I say no, but there is plenty of literature about that on the web.

I’m not saying that. I think people will become nicer in general, but deviants will continue to exist.

Peaceful capitalist envlaves would not be overrun by more aggressive and violent profit driven enclaves for the same reason that South Korea isn’t overrun by North Korea; the former would be so much more productive and therefore stronger.