I've never had anyone in my home that myself or a family member did not invite. I invited the contractor (including his crew) in and have known him half my life, so I trust him when I'm not there.
The point is, **** happens and because my standard for killing someone in more than them simply being in my home unexpectedly (to me) they are still alive and I'm not in prison.
So finding people in your home unexpectedly is acceptable to you and then you feel the need to start to draw your weapon cause you are not sure who they are. I ask you, What is wrong with that picture.