That's my point. It's all about doing self-interested things like mutual aid. Mutual defense is in my self-interest. A dairy co-operative is in the farmers' interest. Zebras move in herds because it is in their mutual self-interest.

The initial comment is saying communism is about self-sacrifice, against human nature. Kropotkin (I've read the book three times btw) convincing makes the case that it's the opposite of self-sacrifice: about pursuing our natural mutual interest according to our evolutionary imperatives. Kropotkin would say that ruthless competition is against our evolutionary nature and imperatives because it disadvantages survival.