I know guns are different. There are also an enormous amount of ways to cause harm. I personally think that, ideally, nobody should have guns. That's not the world we live in, though. A political government body should not infringe on privacy of individuals because some small percentage may cause harm.
I can make a sword, grow poisonous plants, isolate toxins, or stab someone with a pencil. I do not. I shouldn't be punished for the idea that other people may.