You'll have to point out the part where I proposed forming a mob and restraining strange people. Or are you making shit up?
Understanding the causes and trying to mitigate them in the future has exactly jack shit to do with whether or not the person involved is a "complete scumbag".
You declare the person a scumbag and declare that what was "going on in their lives" does not excuse their behavour or make them any less of a scumbag and also try and understand causes. We do this all the time, so I'm a bit surprised you could be so incredibly stupid as to not notice.