If you build a man a fire, he'll be warm for a day.
If you set a man on fire, he'll be warm for the rest of his life.
"We have met the enemy and they are ours..." -- Oliver Hazard Perry
"I don't want a piece of you... I want the whole thing!" -- Bob Barker
They showed a clear lack of regard for him. They acted with extreme prejudice. They are thought to have stolen from him previously.
He did what anyone would have done that thought they were fighting for their life and had just had enough.
I commend him.