Why would that be a bad thing ? Kids that don’t have reasons behind their beliefs are the biggest suckers later in life. If they only ever see one viewpoint on Capitalism, they will not invest any thought in that viewpoint, can’t defend it later, and are suckered into Communism. Kids SHOULD be exposed to Communist propaganda films, then asked to critique them until they see where the lies are.
Did you think Communists in America were all raised Communist ? No, they were raised Capitalists, but nobody ever bothered to explore with them why Capitalism is good and Communism bad. At most, information about Communism was treated as forbidden fruit, or only the bad aspects of Communism were discussed — the “free stuff” aspect of Communism being superficially a “good thing”. Kids should be raised to be critical thinkers, and they can’t do that if they are never exposed to what other people believe.
I think the problem is you fail to see the difference between a propaganda film and exposure to the ideology, like Das kapital for example. A propaganda film sidetracks the mind by appealing directly to emotion. That’s why it is so effective. When kids are watching it in a movie theater, they are not able to ask the tough questions.