Would you kill?

If someone killed a member of your family, went to trial then got off despite the evidence would you kill them?

We were talking about a case where this guy had killed two people (at different times), in the past but there hadn’t been enough evidence for a conviction. He then killed a man and there was a witness this time, she was put into witness protection before the trial.

He went to court, the mother of the man he killed was there watching. He got off. She left very quickly and was waiting outside to talk to him. She later said she wanted to see his eyes. She said she could see his distaste for her as a person. She shot him.

So we got talking, if someone murdered your loved one, if they were going to kill again and ruin other people’s lives, could you do nothing? Could you wait for years for that person to be caught, when in that time they could kill, and ruin someone’s family – someone’s friend’s lives?