What would you think if I blasted a shotgun through the door the next time someone rings my doorbell?
You don't usually have to do this. What would make you get so violent with a gun?
More often than not it's just someone trying to sell me some crap or want money.
You don't like having intruders ring your doorbell, but they are harmless usually. Just telling them no will suffice. Shooting someone will have the police at your door next, and you can't shoot them.
Why not? They are trespassing on my property and I have the right to defend my self.
The other police would almost certainly shoot you if you did this. Just abandon this whole idea if you want to stay alive.