Right, but your list of potential non-thieves was

neighbors, missionaries, salespeople

So, either you think booby traps are sprung simply on door knocks/bells, or you think neighbors, missionaries, and salespeople can reasonably enter your home and make it to your internal traps without express permission or consent to be on the property.

Lets say I set up a whole ass grenade bouquet. A Mormon knocks on my door, nothing happens. The Mormon leaves, nothing happens. A Sales guy shows up next, rings the bell, nothing happens. He thinks "dude's not home, let's go inside anyway" and breaks in, he goes up the stairs and hits a tripwire...

But why was the sales guy inside? I don't care if he "just wanted to leave Verizon literature on my pillow" or if he was a "thief," he shouldn't have broken in.