Isn’t he a closeted gay man? Perhaps the Deep State has something on him.
I believe that is considered to be the situation.
In this day and age though, it would take something pretty bad to blackmail him unless it’s something worse than that.
Napolitano is gym. His partner died not too long ago. Maybe his partner reined him in and, since the guy is now gone, Napolitano feels unfettered in broadcasting his biased opinions.