In two words: bite me. there aren't too many things that i'm a raving aboslutist about, but the freedom of political speech is one of them. If my employer attempts to step on my neck for saying things about china that china doesn't like, on my time, and my personal accounts, their next contact from me will be from an ACLU lawyer.
And it's not the US government leaning on them, but a foreign government. Don't see a legal case here, and it's even in-line with popular moral sentiment nowadays.