Their fear of Trump is 100% the driver of their actions. It's such a controlling factor of their behavior, that they rushed through not one, but two pathetically flawed unpeachments against Trump. Even if there are some republicans who could be convinced to vote for these lies, they're presenting them so badly that no republican other than traitorous rinos like Romney will vote to convict.
The people know Trump stands for them and with them, and will fight like hell for them. Unlike DC swamp rats like Pelosi, Schumer, and Biden, who have been in office for decade after decade and accomplished NOTHING. They're DC swamp rats that *need* to stay in power if they want to continue to line their own pockets. They could never earn money on their own the way Trump has, and they know it.
That's why they fear him vBackman. They know the people love him, and that just won't do.