So, in all honesty, if someone walked down my winding gravel driveway, made it past my outdoor dogs (not likely) and got into my house without setting off the alarm (not likely). I would automatically assume they were a threat to my 7 kids and attempt to incapacitate the intruder with a blow to the head - before they could explain themselves.
Which would be a fair bit kinder that what might happen if my father-in-law woke up first. He'd begin deliberations with his shotgun.
I will hazard a guess that most of us differentiate between "person in my house for unknown reason that may present a danger to people in the house" and "thieves, in general" and that might be tripping us up here.