From things you’ve written before I suspect the point you were intending to make is “in practice, people will act in this shitty way because it’s advantageous to them”. But the actual words you wrote—and the place you put the comment—clearly denote “we should act in this shitty way out of self-interest”. I more or less agree with the first thing and disagree strenuously with the latter. (And I really hate the thing you do where you conflate is and ought on things like this.)
From things you’ve written before I suspect the point you were intending to make is “in practice, people will act in this shitty way because it’s advantageous to them”. But the actual words you wrote—and the place you put the comment—clearly denote “we should act in this shitty way out of self-interest”. I more or less agree with the first thing and disagree strenuously with the latter. (And I really hate the thing you do where you conflate is and ought on things like this.)