If I buy a megaphone and mouth off highly objectionable speech at Speakers Corner, can the megaphone manufacturer be sued? Didn't think so.
The blue tick was always about establishing the authenticity of the speaker, not a validation of what they say. Where a "celebrity" speaks, we should always be able to validate the real from the fake and the satire.
Twitter undertook some due diligence to ensure @realDonaldTrump was the real Donald Trump. We should always have the ability to identify his bile as genuine, removing the blue tick because Twitter doesn't agree with what he has said is a bad thing. Sad.