To forgive or not to forgive

A man executes his best friend in order to save him from an angry mob.

You may be angry at this man who killed his friend, but maybe he was saving him. Had the angry mob gotten his best freind then they would have tortured him, so when this man killed his friend he really did him a favor giving him a more humane death then being tore apart by a mass of humanity. He should be forgivin. He saved his friend from a terrible death.