Their solutions are misguided, but their reasons arise from a perception of a very real problem.
It isn't actually necessary to turn to religion or conservatism to find depth, meaning and groundedness; depth, meaning and groundedness are always abundantly accessible. But nothing about western culture makes this obvious, especially in the mainstream.
Turning to religion and conservatism as a solution to the degradation of mainstream culture is just replacing the modern systems of mass-scale thought control with the old ones. It's a completely maladaptive solution to the problem, but you can't ask people to just keep participating in a worldview that feels like it's sucking your soul out of your body 24/7. You need to offer them something nourishing and authentic. Nothing in mainstream liberal culture offers this; it's self-evidently phony, soulless and vapid.
This isn't something the left can just dismiss. There needs to be something on offer which meets these needs better than both mainstream culture and the regressive belief systems which caused so much suffering in the past.
It's incredible how much money the Americans can afford to blow just on exploding stuff overseas. Their healthcare system and infrastructure must be phenomenal.
Communism is such a non-thing in the west that western rightists have to make up imaginary communist threats to be afraid of, pretending devoutly anti-communist institutions like the Democratic Party and the World Economic Forum are communist, or that "woke" stuff is communism.