This one is so simple

Libs hate twitter being a free speech engine because then the truth (which lies almost entirely outside their narratives) will be widely known and understood by the masses

Making them impossible to control for the left

And making the libs find out about how completely they've been fooled, how nearly everything they cherish near and dear to what's left of their heart is carefully fabricated propaganda, causes a psychotic shift

For those of particularly fragile neural makeup, their religious belief in global warming, whites as evil, Trump as Hitler, and government as savior, can't take being shattered. These subjects are unable to simply swallow the redpill, palm their forehead, and finally accept 'media as liars' and Trump as a patriot who can be abrasive but was telling the truth all along.

Instead, the left wing extremist's brain is ill equipped to handle the revealing, and it dissociates from objective observable reality. They develop what looks like a sort of Dissociative Personality Disorder as an adjunct to their Trump Derangement Syndrome (a/k/a "Reflexive Exaggerated Trump Authority Reaction Disorder" kekekeq)