The problem here is that he was not surprised by the burglars but knew they were coming and was luring them in by making it look like no one was home all the while watching on his live video.
It’s one thing to then detain them, to tie them up, even shoot them if they don’t cooperate or threaten you, but what the prosecution is showing is that he wanted them to come in so that he could kill them and then claim self defense.
Kind of like a living “trap gun!” However, it is his house and he can do whatever he wants while inside; i.e. “lay low.” I would still go manslaughter. The people inside were engaging in a dangerous felony. Should we not draw a veil over what a homeowner does to those engaged in Burglary in the home? His home is his castle and one Burgles at ones peril.