Liberals believe it because they don't worry about facts and reality.
After following Twitter for a little while today, I was amazed how many folks say "GZ is a child killer...period. He wanted to kill a black kid and that is exactly what he did."
Liberals don't let the truth get in the way of their opinions.
Did you happen to notice if there were multiple people using the same terms and phrases, like they were working from a prepared script or list of "talking points"?