You forgot it's mostly about Chinese Communist Party influence (or eventual influence) if they get firmly entrenched in the public mindset of the USA. No nation political apparatus should have such a large direct (actual or potential) influence into the minds of the US public. It's a national security risk of the highest priority. Not every security risk is saber-rattling or direct cybersecurity threats. it's one thing if citizens look up and pursue the CCP's philosophies, but this is about stopping the direct injection of said propaganda straight into our toddlers, teens, and tweens brain. They shouldn't have to suffer because of some absolutists take on the first amendment, when we have various limits for the public good all over the place.