Thats where it gets muddy
He was in the area to protect local businesses and provide medical care where needed (from what i read, he even treated one of his first assailants, after he shot him)
If i got the timeline right, he passed from a car dealership to a mechanics shop and gut cut of by a police line and had to find a different way out (which is where he got attacked in the video i posted)
Now, NONE of that explains why a minor is open carrying a gun in a state where he's not old enough to legally do so
Of course, if the powers that be would uphold their oaths there would be no need for armed civilians to protect their property from criminals