It is not about an 'amount' of property, it is about a persons right to be safe in their own 'home' or dwelling. If someone breaches the sanctity of another man's 'castle', then I believe that deadly force is justified. You have to assume that an intruder is not in your home to bake you a cake.
These cases would be best handled by a jury, imo. If an intruder was unarmed and had done nothing to hurt you or another person in your household, then I feel you should probably be charged with manslaughter at least. Each case is different though, thus the jury.
Your personal sense of safety isn't worth anyone's life.
Check out this guy, he didn't break into peoples houses to steal shit, he broke into peoples' houses to murder them.
http://murderpedia.org/male.C/c/chase-richard.htm
He would basically rush into a house and immediately shoot/stab everyone he saw. How do you protect against something like this, if you are unarmed?
If a man with a gun enters your home and you kill him then hopefully you're let off without any charges once you've been to court. Thankfully, this sort of thing almost never happens. Maybe if you're living in a ghetto or similar it might make sense to worry about this sort of thing, but even living in a poor area as I have often this sort of thing just never happened. The only people I've known of in my area that were murdered were shot by police or killed by a disgruntled family member (with guns they own lawfully and keep in the home).
You do have the right to protect yourself. And you definitely should have that right. These things do happen, if rarely. I'm not saying you shouldn't be allowed to keep guns in your homes or use them when faced with armed individuals. That's a little too extreme.
What I'm saying is that it doesn't make sense to me why a person living in areas like mine would even want to do that. Spending money and harming oneself psychologically in preparation of something that will never come. Being fearful of the highly improbable. Increasing the risk that you or someone close to you will be accidentally injured. Increasing the chance that a family member will commit suicide. Those things happen more frequently than violent people enter homes with murderous intent.
We'll just have to agree to disagree. I'm not trying to take your guns away or anything, I simply have no interest in owning one myself. And I bet I'm never murdered in my home.