I surmise they were quickly silenced by medical boards that threatened to revoke their license to practice if they didn’t follow the “correct” protocol.
Just like we have politicized bar associations that go after lawyers that dare to defend Trump supporters, the medical boards are leftist infiltrated too.
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This paragraph:
"If the medical profession refuses to confront what happened during the pandemic—if it pretends that physicians were not pressured, censored, or punished—then the same mistakes will almost certainly be repeated during the next public health crisis."