As an American who grew up with guns, it's never been much of a thought. They're just normal tools around the house like so many other tools.
I have a concealed-carry permit but almost never use it. There's just very, very little chance I'll be in a shooting situation anyplace.
On the other hand, if some crazy person were to break into my home with intent to do harm, I certainly have no qualms about shooting him before he shoots me. Killing somebody who's trying to do harm to me or mine in my own home is not only morally correct, there's a mild moral imperative, given the means and opportunity. Certainly I wouldn't shoot some idiot who's simply drunk and stopped at the wrong house, but a break-in with apparent criminal intent is an altogether different circumstance.