I mean, I carry a gun regularly, and if I ever have to use it, it's 50/50 whether only not I'll be charged.

Actually much less likely in my locale, but if I'm out of town...

Some places are more willing than others to charge anybody using or brandishing a firearm, regardless of the circumstances, and sometimes those exactly are the states which charge very aggressively for it. Heck, I've heard of people just being charged for driving into a wrong state with a loaded magazine laying somewhere in their trunk. Not all laws everywhere make sense.