My understanding is that, apart from some slight long-term risks, there isn't much downside to having one kidney - but people regularly die for lack of one. Now don't get me wrong, I'm very hostile towards 'effective altruism' or utilitarian-style thinking, but I can't see any serious reason not donate (aside from the fact that I'm at high risk for polycystic kidney disease). On one side, temporary inconvenience, and on the other, extreme suffering or death.
Is there a good reason not to?
Is there a good reason not to?