I think this explains a lot.

"Several times, I've heard people say, "Oh, I don't trust myself to own a gun." They're not talking about being clumsy or accidentally capping the dog during a shotgun cleaning; they're talking about their anger-management issues. They're saying that they are such uncontrolled bottles of rage that they don't trust themselves to own a weapon without murdering someone."

Cracked I think has hit the nose on the head about why anti-gunners/anti-rightists are so vociferous.

They can't control their own anger and they ASSUME everyone else is the same.