Assailants, murders, bad guys, and general criminals can take your life away from you outside your home, through a wall, via a car, and from a further distance than a shotgun could defend you from.

Aside from that, and as I've stated, in that moment of panic and terror when your life is about to end, operating a weapon that requires a pump or a bolt action is not ideal. You'll jam it up, forget to pump it back, etc.

I also don't quite understand how other people can dictate to me that I shouldn't own a one trigger pull / one shot weapon because it looks scary - while being somewhat functionaly identical to a non-scary looking simi rifle or handgun.

Let's not go and pretend surprise drive-by shootings and long-range snipings are the standard case for a home invasion.

So what issue do you have with me owning a single trigger pull / single fire AR15?

I have an issue with folks being able to own one with less vetting and registration requirements than you need to own/operate a car.

I have to prove I can safely operate a car to drive one.

Unfortunately for you, the Right to Keep and Bear Arms is an enumerated Constitutional right, and there are strict limits on the restrictions that can be placed on those.

Any analogy with merely owning a car fails hard, in all but really revenue hungry jurisdictions car ownership has no restrictions of this kind. It's only when you want to put it on the road that you have to get plates and a licensed driver. And there's a vast distance between the skill and experience needed to safely drive a car and use a gun; in just accidental deaths, this shows in the ratio of 58:1 from memory when I last calculated (> 30,000 vs. a bit over 600 annually; I can look that up if you want).