Whingey
Good. Hope he gets beaten up
Encouraging prisoners to be violent towards each other really doesn't help anyone - neither the families who lost their little girls, nor the staff in prisons who have to deal with this kind of institutional mayhem and lawlessness on a daily basis
If assaulting someone is against the law because it's wrong, then it's still wrong even if you think the person deserves it.
A more constructive response is for a public inquiry to examine why the hell the various agencies dealing with this youth missed all the opportunities to deal with his psychopathic obsessive violent streak, and get him off the streets before he could actually, as he did, kill.