> From what I see in my feed, it seems 100% of "progressives" have doubled down on their hyperbolic, established, in-group rhetoric

Then that's a problem with your filter bubble.

> I followed everyone that I follow because they are programmers, not because they are "progressives".

Which is why your view of progressives produced by that is distorted. Programmers who happen to be progressives aren't representative of progressives as a whole (they aren't representative of the broader group along class/income, education, race/ethnicity, or gender lines, among others, and several of those do correlate with preferred approaches.)