Because he is a seditious bastard. And would cause violence when he loses again.
Part of this is that they don't want anyone talking about election fraud......they want to paint those that question it as kooks.... This looks like an illegal hostile take over.... the way that communists do it...
As sedition is to the Confederates.
Maybe you are referring to the 2000 election which was far more fraudulent than this one.
Trump performed as expected. Why that is hard for you Trumpsters to understand is incredible
He was not a popular President and just botched his pandemic response. That is not a winning formula.