Those guys who keep a fish an inch or two over the limit needs killing, but don't ever use it on illegal aliens coming into your state to commit felonies.
Most, if not all, state trappers are licensed to carry a gun.
They do not enforce creel or size limits of game or fish or hunt down illegal aliens.
The gun (most of which are .22 revolvers) is for protection from the animals they trap and to dispatch any of the animals that present a problem.
Most state trappers are contract employees, not actual state employees and do not work under the color of state authority.
I have tried to remember an incident wherein any game violator with a fish 2-3 inches too long, was summarily "killed" for the violation, but have not been able to find any.
Have you a source?