It’s not about atrocities at all. It’s a question of whether kids understand that they are signing up for a job that involves using explosives to kill people. It’s kinda hard ignore that aspect of what the military is, no matter how sheltered or propagandized one is. As the propaganda has grown, so has the ability of literally any child to google “what do militaries do?”
Being aware of the atrocities might require someone to have been paying attention at some point in school, but knowing that you’re gonna face bombs and killing in the military, that takes even less awareness.