Well, I own two fire extinguishers, have a gas mask and was trained for first aid and CPR, so.... your point?
Wait.... did you just say what I think you said?
"It would save much more life if more people would learn first aid than having a gun for home defense"
Are you saying that it would be better for me or a roommate to get shot, stabbed, etc and for me to know how to save her life rather than for me to own a firearm and kill the intruder before he can do anything? -_- >.> <.<
"Why should a Thief kill you and should other people invade your home?"
I dunno, ask them the next time you meet one. They do it because they're stupid, poor, an asshole or who knows.