Isn't that what war propaganda is about? To highlight differences and paint an enemy in the worst possible light as a way to rally against a fanatical enemy who doesn't consider you human.
Though I find issue with how you view dehumanizing the enemy as acceptable as you say they don't consider us human, and I'd argue that such dehumanization always causes more harm then benefit, neither of those points matter here.
If that's how you view war propaganda, clearly nearly a century after the war things influenced by such propaganda should not be exposed to young children.
