The ZMan explains:
That’s an important lesson to keep in mind when watching the antics of the Left of late. Their lunacy is not directed at the rest of us. They don’t care what you or anyone else thinks about what’s happening. Their public acts are about signalling to the rest of the believers. By holding protests and making fools of themselves in a public way, they are providing support for one another as they work through the disconfirmation. Like herd animals, they are huddling together in the face of danger. It is pure instinct.
If they were left to sit alone at home, they would have no one around to help them through their doubts. These are people whose entire sense of self is dependent on the identity of the group, so getting out and “making their voices heard” lets them focus on something other than the disconfirmation. Trump as Hitler provides a short term bridge between the failed prophecy and whatever comes next for the New Religion. They can tell themselves that their faith was not wrong, it was just subverted by mysterious forces, or Hitler.
In the past, Progressive Awakenings were followed by period of hibernation as new missions and causes were conjured by the next generation of believers. The trouble for them this time is there is no obvious replacement for identity politics and social justice. When you’re reduced to championing the rights of mentally ill men in sundresses, you have run out of victims.