The distance to fall is very short in most countries of the world, not just in the US.

Peter, I have guns. I have rifles, pistols, revolvers, and shotguns. I have cartridge guns and black powder, muzzleloading guns, and I have the ammunition for them. I have shot and used firearms for nearly half a century, both as a civilian and in the military. I have carried a gun during disasters, as a member of the National Guard. I have experience both as a Military Policeman and in the Infantry. While I am not an "expert", I think that I can speak about guns and their use.

Untrained people think that the mere possession of a gun makes them invulnerable, some sort of superperson, and it will solve all of their problems.

It won't. It will, if anything, compound them.

Suppose that you are sitting in your living room, defending your home, behind a quad-.50 machine gun (or any of the others pictured here). I am outside and have a single shot .22. Who wins?

Answer: Speed's fine, but accuracy's final. And you have to see me to shoot me, and you won't.

Besides, all I have to do is keep you pinned down until you're out of ammo.

If you MUST have a gun, go get one of these.    More importantly, go get trained. Learn to use it well, and most importantly, learn when NOT to shoot. To do this well will take a lifetime. (And if you think a .22 is silly, think again.)