By “my property my rules”, no problem.
By some sense of humanity and fairness, yes, there’s a problem.
Apparently the man was naked and unarmed in the shower. I might have hauled him out of there and kicked his naked butt, but I don’t know that I’d need to even grab a gun (although that’s helpful, but not worth going all the way to another property wherein he might run away) much less blow him away.
I agree. I’d have left, called the police, and then staked out the front door with my rotties to make sure the showerchild stayed around until the po-po got there.