This is literally the same shit the Nazis did before industrializing murder. They would get soldiers to just shoot people into pits. They sent Jews en masse via train to camps to starve and die.
It was disgusting in the 40s and it's disgusting now.
Part of the reason the Final Solution came to be is because the Nazis needed a more efficient way of killing people because of the toll all the shooting people in the head was having *on the morale of the Nazi soldiers*