We need M4's because the military uses M4's. And I am more afraid of my own government than the civilians who live under its rule. As I should be. Fuck tyranny in all forms.
When you solve a problem, you don't remedy the effect, you remedy the cause.
The problem here is not that a civilian had access to a semi automatic rifle, it's that he was bat shit fucking crazy.
It's not about gun control. It's about control. You can go be a defenseless pussy in your state, I'll be armed to the teeth in Texas.