I don't own a gun, I am 100x more likely to use it on myself than need it for self defense where I'm at. But the scenario I'm describing, whether or not the home invader has a gun or not doesn't matter, the simple fact that they are invading your home in the first place justifies lethal force. You could be injured/killed by them even without them having a gun so the safest option for the resident is shoot them immediately. The resident should not have to accept any level of risk whatsoever in dealing with this situation. You're not getting a gun because someone might attack you with a gun. You're getting a gun because someone might attack you.

Kinda. It’s also a remnant of the old west. Guns were freedom, protection, power, etc.

It would be much more effective to curb crime by meeting everyone’s basic needs than giving everyone a gun.

But dumb Americans don’t know any other way. They are just too self-centered and absorbed to think about anyone else.