He must have been in the 10% that don't reoffend - normally even castration etc. doesn't stop it or make them change their ways.

You have a great father. Both for his first reaction and the fact he listened when you didn't want him to get locked up. I still don't understand parents that just take it lying down.

A few years ago in Germany a woman took a gun to court where the man who assaulted and killed her daughter was on trial, she blew him away. They gave her something around 6-8 years for it.