I'm not the smartest guy or the most well read or what have you, but the idea is basically that whenever someone becomes overtly greedy or authoritarian, the mutual benefits of co-operation kind of ensure that this is a non-issue. Everyone that's co-operating would simply choose not to co-operate with that person, or that organization, and then they end up not getting very far. Maybe if it turns violent, then the same thing happens, just in that everyone kind of mutually crushes the organization, or dissolves it, or what have you.

You know I think the point most people fire back with is that authoritarianism tends to be thought of as like, more effective, right, because they can "make the trains run on time", or some such nonsense, but I think they're just conflating this with the idea that authoritarianism is more effective in a crisis, which is partially why authoritarianism is constantly inventing crises to combat. The idea, basically, is that if you have a singular leader, you can pivot and accommodate things more easily, make judgement calls easier, and you gain a capacity for rapid response. This is, you know, questionable, things end up being more complicated in practice, and leaving everything to a singular point of failure is a pretty easy way to make a brittle system. At the same time, even were it completely true, it's still only true for the short term, that it's more effective for short term gains. Long term gains, mutual co-operation, is much more effective.

Basically, the refutation is that greed isn't really a fundamental component of humanity insomuch as it is a choice, and anarchism tends to think that greed is a pretty bad one. Not only for everyone but the greedy, but just generally, for mutual, long term gains. If you change the environment significantly enough that you can ensure this is more overwhelmingly the case at the macro scale, then you've kind of "won" anarchism, in a sense, you've won the game.