Conservatives often complain about the lamentable state of their movement. They would do well to look left. Liberals are in greater trouble, and they know it.
In the absence of great ideas and passion, the left congeals around tired ideas of the past. Liberals resort to socialist class struggle narratives that have long grown old and irrelevant. The fragility of these ideas makes them brittle to the point that they would seem to break if opposed and compromised. Safety lies in not changing, and just repeating slogans of the past.