the dad has now said that Ian had a CPL, and that even with years of him becoming more and more volitile, there was nothing they could do about it...

yes there was... you just didnt do anything about it, and are trying to cover your a$$ because of the ration of sh!t that is going to be coming your way by the people of the community, the victims friends and family, and the people that had to deal with what he caused...