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by pas 1328 days ago
the idea is that sanctioning past behavior, which was legal at the time, is super extra bad (ie. no retroactive punishment), because then you can never be sure that the the ruling powers that be won't send law enforcement after you. (of course the brutal truth is that you can never be sure, hence people should realize that there's no opt-out from politics)

https://en.m.wikipedia.org/wiki/Ex_post_facto_law