From a moral standpoint, I can't help but think some people are looking at this from the wrong angle. I get why people want to defend satoshi because "they're the founder/creator", or "it's disrespectful" or "because of everything they've done for Bitcoin", etc, but the same should apply to absolutely anyone. Theft is theft and that's what the OP is advocating. Even if there was someone really terrible who tried to do bad things to Bitcoin, it would still be wrong to for anyone to say we should fork and destroy their coins. Two wrongs don't make a right
Fork versus destroy are two different things if you ask me
And while I certainly agree that stripping someone of his legitimately obtained coins is an outrage in and of itself, this is not the same as forking as it would be as outrageous to forbid someone to fork Bitcoin (even if it were technically possible). So, in a sense, a fork is a workaround for the moral issues your raise in your post
Therefore, if someone did actually try to do something nasty to Bitcoin (say, Satoshi himself, for whatever reason), it would be a right and legit thing to do according to your own considerations as everyone is free to do anything with their fork (including destroying someone's coins)