It is probably because there is a difference between getting mugged and being scammed. With falling victim to SBF's scheme, you probably believe you are partly to blame and you had to face that fact yourself, did some work on it mentally at the very least in the background. Him getting punished does not make a difference, you probably punished yourself and that is what mattered. With a violent mugging encounter, you are blameless, so you need to see the other party get punished to process and to feel that the world will get slightly better / safer with the delivery of the punishment.
> With a violent mugging encounter, you are blameless
I was mugged a decade or so ago, and while I was certainly angry with the people who mugged me, I also punished myself a bit: I shouldn't have been walking down that particular street at 2am; I'd had a bit to drink and should have called a car. Or I should have been paying more attention to my surroundings; maybe I would have seen them early enough to get away, etc.
The point isn't whether or not the thoughts I had were rational. I don't think the type of crime matters; victims always have plenty of room to assign some blame to themselves, or at least second-guess their actions.
