"...held alleged mail thieves at gunpoint..."
Exactly. How does he ascertain for certain its a felony crime or that anyones facing murder or permanent bodily injury?
CCW aren’t police.
I am not against holding a criminal at gunpoint but unless you genuinely believe they are just going to retreat, regroup and attack again, or will continue deadly/potentially deadly violence towards others if they leave,
the law will not protect you if you do this.