No way can you justify shooting a kid because he was in the wrong place and it is beyond incredulous that the girl did not know the kid was under her bed....
Dad shot him because he reached for “something”....could have been his phone...
From a personal experiance throwing the young lad out on his ass by way of the front door is far more statisfing than having to kill him....
Well, at least you acknowledge that the father had to kill him.