I imagine there was residual indignation lying within her, which needed to be expelled. The effect that had built up over time (however many weeks that had passed by then), that she'd been a prisoner inside her own cellar, that he was still putting up resistance to her (by crawling away) instead of facing the issue - all manner of subtle things that are relatably detectable when one has done something wrong (depending upon what it is). I was somewhat recently reminded of something that happened when I was 4. I'd basically forgotten all about it and even now can't personally remember the events leading up to it, but I know that my response to it would've come as a result of something that had built up over a considerable period (which I'll explain below). Apparently, I was being bullied by two different classmates at my nursery. This may have gone on for several weeks (possibly a month or two perhaps???). During that period, I'd not retaliated in any way, but was "putting up" with it by internalising the effects, without of course understanding what was happening to me. Then one day (I can maybe just about remember this bit), I snapped when one of the bullies must've done something again, and I started pushing their chest - hard - several times over. I have a very vague memory of the look on their face when I was doing this... complete shock. And do you know something? Nothing ever happened again after that. AND, we became friends. Still are to this day, decades on. We basically formed a real and lasting bond because of it. My mother was told by a member of staff at the nursery about the incident, which she witnessed, but thankfully chose not to intervene in. I would've forever resented her had she done so - it would've lain in my subconscious to this day had she done so. She told my mother that she was aware of what this other child had been doing to me, and stayed away when I eventually had had enough. The thing is - not really ironically - that I now trust BOTH of them much more because of this experience. There would be far too many people today who would be unduly concerned with health and safety (in other words, covering their own backs or "following procedure") to "leave it be". And guess who would end up suffering as a result of that in the long term?? My recommendation (though paradoxically I DON'T recommend you do this!) is that you rob somebody at gunpoint in a dark alley, violently pulling off their necklace and fleeing with it. See how doing that causes you to feel. Then stumble upon the person who you undeservingly stole from several weeks later, and torment them still further. See how putting yourself in that place causes you to feel? It makes you want to cry. You almost WANT that person to beat it out of you, don't you?? Then you'd know you'd gotten what you (really) wanted. Now transpose that feeling into this video's scenario (and the actual mugging video). As for the idea of "vigilante" justice, with the exception of divine justice (which I consider to be perfectly fair), EVERY other form of "justice" is fallible. As far as Marge may be concerned, this was perfectly fair, because - as far as the viewer is aware - the course of events from beginning to end, was perfectly round in respect of delivering justice. In ""normal"" life of course, there could always theoretically be nuances which would lead to complications further down the road. But again, my suggestion would be to see what would happen if you target an innocent woman in a dark alley and threaten her at gunpoint. Though of course, not really. You'll just have to take my word for it that it was just.