I can promise you already, when they finish the investigation and have spend a million of Dollars on physical and mental evaluations all they will find out that he is a total normal (I would even say boring) guy who had just enough being fucking pushed around.
That will scare the shit out of them and serves these criminal cocksuckers right.
Any other day he may have just taken the ticket ripped it up and cursed them... today was just the day for him to go to war.
Come to think of it, this is for a long time the first time i see some guy shoot the "right" people, he didn't go to a cloth store to kill some pregnant mother
he didn't punk out he got right down there and showed them whats business.