Censorship and avoidance of discussion of serious topics certainly is a thing in the american media, however it operates mostly on the basis of backscratching, co-opting and voluntary pushing of viewpoints by private media establishments.

Its not difficult to find dissenting voices on pretty much any topics you care to name, and calls for collective action too, and nobody does much (or in reality, can do much) to stop them, the real trick of American censorship and propaganda is these views are never seen in the major media sources the vast majority consume.

This is a vastly different model than how censorship in China operates, with different consequences, and different ways to oppose it.