Especially with how far right the Democrats have trended since the 80s and their adoption of a corporate focused form of third-wayism

You might wanna give "third way’ a Google, because you do not know what it means.

There are very few actual leftists at any point in US politics because leftists don’t exist as a substantive bloc of US voters. Bemoaning that people who aren’t leftists don’t do leftist things doesn’t really make a lot of sense