He wasn't dealt with. He deleted his account in a frantic and futile attempt to avoid exposure.
Violentacres/Violentacrez (had to block him twice) set himself up as king of the reddit underworld. The admins cast a blind eye to his antics, and in return he prevented the raw sewage from gushing onto the clean streets of the reddit front page.
He was a troll from the start, and deliberately so, even in his choice of username which he had stolen from a popular blogger at the time. This illustrates the kind of brinkmanship that was his trademark - it is not quite impersonation to steal someone else's anonymous handle, but it is not quite ethical either.
His one good point was that he kept the other reddit trolls busy via interminable (literally) troll-fights.