Considering you don't want people to be able to defend themselves as effectively as possible, your concern for innocent people rings very hollow.
I'd like to see your stats on the number of uninvolved people killed in shootouts. While you're at it, look up the number of people killed by criminals when the victims aren't allowed to defend themselves.
I guarantee one number is way bigger than the other -- and not the way you want.
Effectively is in your mind. You need to reassess what normal and common means. Is it common to rig your house up like Home Alone? Do that and you won't need any firearms. Is it prudent to have bear traps hidden in the dark, dark back yard in case intruders come in that way? I guess you could justify that small children cutting through your back yard to get home might be considered an intruder. And since they have arms, they could be construed as an Armed Intruder.
Do you need a 30 rounds or 50 rounds or 100 rounds or 200 round mags or box mags to defend your home for intruders? Or you can have an M-2 50 cal MG with the Belt Ammo fed from a Panel Truck where you can run at least 1000 rounds before you need to do a barrel change. That'll stop those damned Avon Sales people cold.
For Jehovah Witness, just wire the doorbell to a car battery powered ignition coil but make sure you have standing water on the mat at all times.
Yes, these are all in excess and are in no way considered normal or common. The Courts finally came up with a limit. It's been hit and miss before. As entertaining as what I mentioned is to you, it's a friggin movie not real life. Not one dies in the movies.