Well it’s because they want to trivialize impeachment.
The GOP are getting good at this whole making the worse case true. They’ll go on about how Government is horrible at making medical choices and then block every advancement of healthcare solutions and say “See! I told you we were bad at this!”
They went on and on about how Trump’s impeachment were politically motivated and so now they are demonstrating politically motivated impeachment as a “See! We told you impeachment were politically motivated!”
Everything they indicate that they bemoan about politics, they themselves bring into reality.