A neighbor friend of mine who lives twenty miles away (from my hollow tree) happened along where a trooper had been wrestling with some unkempt knuckledragger who thought he had more right to life than anyone else. And asked the trooper if he needed a hand before approaching. 
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Least my friend be thought of as an accomplice to his first problem, he used what is common-sense to some Alaskans, & asked first. Even though he could plainly see the trooper was in trouble & probably needed a hand.
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Although my friend had a legal registered weapon in his vehicle, as many who travel the roadways here do, didn't approach with a gun before or after asking the trooper if he needed a hand. He used two & had no gun. In a few moments the guy who had taken the troopers gun was immobilized but not killed. 
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So this kind of thing can happen anywhere, one need not be a zealot 2nd amendment person to realize there are many other laws on the books that should be taken to heart & kept in mind equally. ;)