Few parents look the other way . They feel powerless to help them.  Wasn't this guy an adult ? If you spank your kids they can have you charged with child abuse.  Today's parents have it the hardest of all time.  Are parents supposed to have jails in their homes and ankle monitors so they know their each and ever move ? Even then , we can't be there 24/7 .    To your point about the victim , while there is no doubt she was a wonderful girl---she knew she was dating a guy with issues--but thought she could fix him.