Well, no matter what... the old adage is still true in a home invasion, "carried by six or judged by twelve." Over my lifetime, I've seen the best and ugliest in mankind... there is no end to what criminals or desperate people might do. No home is a fortress, my rule; "it's easy to get into my home, the hard part getting out." Personally... I wouldn't shoot anyone for material objects, nothing other than the preservation of an innocent life, or my own is worth it, but... test my resolve and they'll find out where their ends and mine begin... if I have to survive the first contact "nothing" is off the table. I'm not pointing at anyone's comment(s) here, just saying how I feel about the self-defense issue that came up.
Yes, you do need to understand what constitutes justified homicide, look at your state laws, or call the County Prosecutor's office.
Just my 0.2 Cheers