Looks like I’m in the minority here, but what this guy did was totally wrong. If I were on his jury, I’d be voting guilty and recommending a death sentence on top of that. He has no such right or authority to do this regardless of the fact his victim was a child molester.
The shooter is facing serious legal consequences. If the alleged crime involves planning to shoot, luring him, and robbing him, the State of Texas may charge the shooter with Capital Murder.