People get their opinions where they get their corn pone at. This is why class analysis is the most reliable mental model for understanding politics. As such the left in the US has forgotten about it, as understanding politics means "we have met the enemy, and it is us". So rather than abandon their old ideology, they have chosen to become blind idiots focusing on irrelevant shit so they can pretend they give 2 shits about the class they used to be part of.