And what do you do when those elected won't enact effective laws, or the courts won't enforce them? In short, when the very government whose first responsibility is to protect its citizens, fails miserably to do so? It's 4 years between election cycles. A long time to wait for redress of grievances at the ballot box. And NO guarantee of change even then. How many children can predators harm or kill between elections?
The guy who offed these two scumbags should be tried for murder. THAT law works, at least. He'll probably get a harsher sentence for his crime than his victims got for thiers. But I'll be damned if I'll cry any tears for the two SOB's he killed. Have they "paid" for their crimes? NEVER enough. Their victims will also pay, every day of their lives. Just ask my sister, pal. She'll tell you.
So vigilante justice is the answer? I think not.