Do you lock your doors and windows? In what scenario does someone who has bypassed your domicile's security at night have anything other than malicious intentions?
And you are willing to gamble the lives of yourself and your loved ones on the assumption that the intruders' only intentions are theft? Why? To protect the intruders' physical wellbeing?
I dislike the term 'bleeding heart liberal', but I think it applies here. There's a difference between 'love thy fellow man' and 'worry about the health of an intruder in your home at 3am'.
We have a word for this, it's called naive.