History. And Stuff.
The question I would ask is whether the CCP, a government agency, may be compelled to show whatever artists feel should be shown. Put differently, is the CCP free to choose what it wants to show without violating freedom of expression?
While what is expressly guaranteed by the Constitution is the freedom of speech or expression, the guarantee does not exclude the freedom not to speak. The freedom not to speak is pure common sense such that, perhaps, for this reason there is no constitutional provision specifically guaranteeing it."
Art and the Right Not to Speak by Father Bernas
Precisely. It cuts both ways.