Nah, just a contingency plan to scare em off for a few days while you find new parking. Most thugs aren't going to risk their lives for a $30 parking ticket. They see a gun and they'll leave you alone for a little bit. Don't be surprised to see your car keyed up while you're gone though.
Quite. And what's to stop the 5 criminals from carrying guns as well? Pull a gun and get yourself killed in self defence. Great job, Captain America. This is why guns are a stupid thing to give to the public.