I don't have to let trump stand on my front porch and scream lies at top volume, and twitter doesn't either. Twitter is protected by the first amendment here, not trump.
Twitter's platform is private, not public. Twitter should waste no more time in making that crystal clear.
If you own the printing press, you get to decide what you print. If it were otherwise -- if the government, or anyone else, could control what we said and didn't say with our private resources -- well, that's not anywhere any of us really wants to live.