I'd say he's gotta be found guilty of illegally transporting his fucking weapon. Your laws being what they are whether he's found guilty of the shootings i wouldn't bet money on.
Being guilty and being found guilty are two different things.
He should never have been there with his weapon.
I'd guess the wanna feel a hero got himself into a situation where he felt way out of his depth and probably did become scared for his life, so wouldn't be surprised if he got off the shooting charges.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”