Well most civilised people don't believe in murder. Although what happened to Roy can be deemed as 'street justice', wouldn't it have been better to have him prosecuted and be left to rot in jail?
Better for the victims families as Roy would have been paying penance rotting in jail all these years.
But not better for Roy himself who ended up having the last laugh, where-ever Roy is now, he is laughing at Joey and Anthony who have been banged up since about 1989!