Why should Twitter be coerced into publishing racist tripe?

Why should AT&T be coerced into allowing racist phone calls? Why should ISPs be coerced into hosting racist web sites or allowing racists to download racist content?

The distinction between telecom infrastructure and Twitter/FB/Google is becoming less and less clear by the year.

Your analogy is absurd. Social networks are nothing like telecom at all.

It's more like GoDaddy or NameCheap refusing to host stormfront.

If GoDaddy was the only DNS provider, would you feel the same way? At what point does the government need to step in and say the Constitution applies here?

In an environment where law, custom, or technical challenges makes it difficult to silence dissent you can speak out against popular injustice as well as voice unpopular racist opinions.

There needn't be any cultural value in the content of the speech - who claimed otherwise?