This is a parable for our times -- goes way beyond Twitter. Can't "ban white supremacy" when one major party's pushing it! In general, it's impossible to enforce social norms of honesty & decency when one of two major parties has explicitly thrown them overboard.
No company seeking to represent all American consumers can say "we don't tolerate white supremacy," because there's a large faction of that "we" that in fact DOES tolerate white supremacy. If that upsets you, don't get mad at Twitter, get mad at the GOP.
Same thing here. No private co. is going to distinguish true from false news as long as 1 of 2 major parties & millions of its supporters remain committed to falsehoods. A nat'l company can enforce shared nat'l values. Accuracy isn't a shared nat'l value.
Perhaps a more compact way of capturing this: there's no standard of decency or accuracy that Twitter could impose that would not end in banning the president of the US from using the service.
You can follow @drvox.