Because he knows that Trump had a list of people he was going to harass only because they challenged him in some way. They are not guilty of any crimes, but he was going to make their lives a living hell, because he is a vindictive SOB.
That is ridiculous assertion. Trump's inability to accept the fact that the virus was real, along with his attempt to discourage people from getting vaccinated (even though he was) played a major part in the spread of the disease. The idiot got rid of the pandemic response team.