14 time felon vs just one more gun law

With 14 previous felony arrests (state and federal, just for variety), what kind of law do you think is going to stop this person? 

"Angered that his Taco Bell drive-thru order failed to include hot sauce, a Missouri man returned to the fast food restaurant and allegedly pulled a shotgun on an employee, who fled in fear from the takeout window."

He's obviously a raving moron of the highest order.  It's quite obvious that possession of a firearm doesn't seem to bother him.  I wonder if it's one "felon in possession" charge or fourteen, one for each felony?  That was rhetorical.  The point I'm making is that all of the stupid laws that anti-gun folks want in place isn't going to stop public enemy number one, there.  What they will do is stop someone like me from being able to defend myself when he goes to court, gets a 15th felony and is out on the street in 6 months and runs down to his buddy "Mark" to buy whatever stolen firearm he wants.  I lost count of how many laws cotton-headed-ninny-muggins broke, but I'm sure that another one really would have mattered.