I'm really puzzled by how the US believes in free speech, but when speech comes from another country, it's a security risk. Now I totally get that China can use propaganda for "bad ideologies", but again, isn't propaganda part of free speech?
What this whole thing reveals, is that US likes to influence other countries (with its long history of foreign policy), but is afraid to be influenced by others, so it's a bit hypocritical.
And if it's not hypocritical, it's fair game at worst.