If the community is aware of his bad behavior, his family must have known long ago. I would bet he has been difficult since childhood. Perhaps, family members who gave him land, equipment, and whatever else to set him up in farming, were trying to help ground him, get him on a straight and narrow path, give him some focus and a reason to do something respectable. Personally, I think he is very disturbed and has been for a long time, so bandaiding him wasn't going to help. I also don't think SS is his first kill.
And, as a side note, I personally am curious - who the H-E-DOUBLE L names a kid "Quake"???? I don't mean that to be nasty, but I have never heard that as a person's name before now, and I find it quite odd. Is it some kind of nickname?? And if so, what is his real name??
MOO