Can you list some?
If some people are simply uncomfortable around firearms, it's fine with me if they choose not to own one. It's even more fine if they have a real phobia about firearms, like some people do (unfortunately).
There are dozens of other factors, also, that make this a personal decision. (What if there's someone in the house who seems to be not quite fully mentally stable? In that case, if a parent or guardian chooses not to have a gun in the house, that's fine with me. I know a family in this exact situation, and I'm kinda glad they don't want a gun in their house, frankly -- I'd probably do the same thing in their situation.)
The one idea that makes this country great is freedom; it's liberty. Anything that chips away at personal freedoms is not something we should be happy about. Even if we think people aren't using their freedoms in exactly the right way, it should still be their choice.