This is the problem with globalization, isn't it?
If this person is guilty of helping launder stolen funds from Mt. Gox, I'd say he's guilty of a serious crime. If all this is true, then he should be tried SOMEWHERE, should he not? If I live in Bulgaria and write ransomware and steal money from people in, say Brazil, Mexico, the U.S.A. and Canada, what should happen to me? Who prosecutes me? Anyone? No one?
The problem is we don't really have any worldwide laws about this kind of thing or worldwide justice system where these miscreants could be tried and punished. Perhaps the world should start putting together some sort of mechanism like that? Until that happens, it's a case of whichever nation wants to step up and try to apprehend and punish the guilty, sort of international vigilante justice. The U.S. tends to do that more than most, so we get a lot of criticism. Other than just ignoring the crimes, what's the alternative right now, until some international system is in place?