They’re not stupid. The know it’s not worth chasing the left. The left is relatively small and HUGE into purity culture. Not the religious kind, but the kind where they’ll reject you for not being perfect enough. Just look at all the people whining that Biden is only reclassifying weed and not legalizing. The left as it is today will never be content with half measures, and will happily protest and not vote, so they arent worth the effort of chasing.
So Dems have to chase the other end.
If we want change, it’ll have to be leftists joining the Democratic party and changing from within. Because strategically, the left doesn’t help Dems win.