Two thoughts:
1 - Every time they get caught lying about Trump and his supporters, they lose a few more critical thinkers, cause critical thinkers don't continue to trust sources that lie to them.
2 - Every time CNN lies about Trump and his supporters, the sheep think they are being told the truth. So they hate Trump and his supporters even more, because they cannot think for themselves when it comes to Trump. We see that every day in the posts from the lefties.