Earlier quoted context omitted.
Giving a platform to crackpots isn't always dangerous, but in the case of vaccines it's a public health concern. It's definitely not a good idea to give legitimacy to antivaxers during a pandemic when people dying. Save that conversation for another time.
I am a free speech absolutist. The answer to speech you don't like is more speech, not censorship.
Also the absolutist position ignores the limited capacity both in raw time and cognitively to take in information and that pushing people to do better about not spewing out or supporting bullshit is also free speech..