Because he's a threat to the "old guard democraps" who have no ethics.

Quote from article at link below:

" "What's going on here?  What am I missing?"  Nancy Pelosi refers to Scripture, the Deity, and the Constitution.  Adam Schiff disregards with impunity accepted convention about what constitutes fairness in reaching a judgment about another person.  Joe Biden loses his temper in public.  Jim Comey violates rules regarding the leaking of confidential or even secret communications by engaging directly in the illegal behavior, doing so like an amateur intelligence operative.  John Brennan expresses exceptionally bitter anger with threats about future consequences to President Trump and the country.It must be very important for these people to be believed, or they would not be so excessively passionate.  And because they are passionate, they lack insight into how others view their high emotion.  Why might this be the case?=14pxPresident Trump violates a chief rule for anyone engaged in secretive behavior: the only person you can trust is someone you can control."

https://www.americanthinker.com/blog/2019/12/why_do_so_many_people_view_president_trump_as_a_threat.html

This is a great article - - you really need to read the WHOLE article.  Good stuff.