Halakhically, communism is currently different from roman paganism, because it is still being worshipped. So, visiting Ufizzi is easier than Karl Marx museum …
so, if we disregard the low culture of talk show, the question resolves to whether we need to expose kids to other cultures. I can quote here a definite psak from a choshuve Rav, who told the class that he is often gets shailos from college students whether they can attend a class on comparative religions. Students were interested – so that is the psak? Answer – depends on the student. For those who have a risk of being lured by some aspects of the discussed avodah zara, it is not recommended. For those, who expect to meet different types of people in their life and have a mind to address this, the class is recommended.
My post-covid commentary is that this has to be done with parents in the room, whether it is an academic class or a political debate where you can learn together and connect it to the Jewish values.