Most of us do have liability insurance.
It should be required.
Seriously, idiots who can't even go to the grocery store without their lil lollypop on their hip are just itchin' for a chance to blow someone away. They plan to shoot so they should plan to pay.
People who are shot/killed have families. They have parents, spouses and kids. You shoot someone - you owe should owe a pile of bucks to those people.
BTW, its always fun to poke at nutters like the OP and I was semi-kidding about the $1000 tax. I own a pile of guns and hate to think what I would have to pay. But, I don't swagger around, looking for a chance to shoot at someone.
But, a tax like that could be set aside to fund college, medical costs, etc for the families the nutters blow away.
You want the "right" to shoot at people? You can pay for it.