You are actually saying that if I am at home with my family and someone breaks in my house that I cannot shoot them?
This is a basic case of self defense. Would you have me ask the would-be robber whether he was after just my property or the 'ole tie-em-up and murder the family thing?
I think I would take my chances and shoot the SOB in the head.
Ask someone with real authority, and not your cop friends, what the penalty is for tampering with evidence in your state.
No, he's telling you not to move the body. That's evidence tampering. Wether you can shoot them or not depends on the laws in your local jurisdiction and the details of the situtation.
In Texas you can shoot 'em, under most circumstances. Even if they are merely trying to break in. You can even shoot 'em if they are running off with your audio system or computer. Althought the later course of action is not recommended due to possible (likely!) civil action.
Reminds me of a situation that occurred in my home town sometime not long after I left. An old gal, nickname "Bloody Mary", but really a nice old gal, if people left her alone, woke one night in her semi-rural farmhouse to find an intruder coming through a window. The drifter from out of town apparently thought the house, which did not have electricity, was unoccupied. He found out differently, when she blew his head clean off with a 12 gauge shotgun. No charges, although after that her relatives insisted she not live alone any longer, and truth be told the affair pretty much unhinged her. And that wasn't even in Texas!.