While I'm sympathetic to your point, sometimes appeals to complexity like this are asinine. There are plenty of complex problems which yield, to at least a degree, to effort.

Historically cultures have modulated themselves in a variety of ways, including censorship of objectionable speech. Even the United States has maintained, in the past, sweeping norms which controlled what kind of rhetoric entered the public sphere. No one would suggest that these norms were always well applied, coherent, good. But its equally challenging to make the case that because of that ambiguity we should simply do nothing at all.

The ability of companies like Youtube or Facebook to shift culture is probably real and thus probably demands a response, imperfect as it may be.