So...?
Did they kill the animals for real?
Was Lucien stupid or a sociopath? He plays with his gun like it was natural to threat people and like it was a kind of an extension of his dick.
Why would French nazis hire a boy?
The first question, I don't know.
The second, probably. In wars there are a lot of people like that.
The third question, they needed all the help they could get and were not picky.
"Chicken soup - with a *beep* straw."