He then asked if I was willing to shoot someone over my xbox.
I told him, "The xbox was besides the point. We are talking about a person intruding into my house at night with my family present. Hell yes, I'd shoot him. It's the principle of the thing. I'd shoot a hole in my xbox without blinking to do it."
In descending order of importance of ethical justification of self defense:
Endangering of family. <----- Your primary concern.
Endangering of life.
Invasion of home.
Loss of property. <---- The leftist is functioning mentally on this level.
Trespassing. <----- The level at which you are legally allowed to end a motherfucker.
If someone breaks in while you are there, you MUST assume they will attempt to do you harm. A smart(for a given value of smart) criminal cases the place, if they just want your stuff they will break in while you are away, it is when they have plans for YOU that they break in while you are present. A DUMB criminal, even if they just want your things, is very likely to become violent when they find that they are not alone. Edit: also, i would reverse the family vs you, while you may value your family more than yourself(many do), a dead person saves no one.
If you have never been in a fight in your life it's very easy to think that mutual escalation is always the way to go. "oh, I'll just wait until he uses lethal force, then I can respond"