Seems like a tangent either way: letting violent right-wing nazis do violent right-wing nazi things on twitter has definitely made it worse and more toxic than not letting violent right-wing nazis do violent right-wing nazi things on twitter.
Indeed, death threats are worse than whatever censorship one claims happened on twitter pre-elmu, because free speech is predicated upon appropriately responding to death threats. Otherwise, speech can be censored with violence, and on twitter, it is now (along with elmu and friends censoring accounts they don't like by banning them).