Without strong rules in place it’s easy to reason our way into all sorts of behaviour. In particular, it’s easy to underestimate the actual level of harm that certain actions cause - e.g. thinking of the direct effects of eating meat but ignoring the effects of normalising eating meat, or normalising “not making personal sacrifices on the basis of moral arguments”, or things like that. And so implementing rules like “never participate in moral atrocities” sends a much more compelling signal than “only participate in moral atrocities when you think that’s net-positive”. That signal helps set an example for people around you - which seems particularly important if you spend time with people who are or will become influential. But it also strengthens your own self-identity as someone who prioritises the world going well.
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Thirdly, the question of whether going vegn strengthens your altruistic motivations is an empirical one which I feel pretty uncertain about. There may well be a moral licensing effect where vegns feel (disproportionately) like they’ve done their fair share of altruistic action; or maybe parts of you will become resentful about these constraints. This probably varies a lot for different people.
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