Excellent write-up. I'm with you -- Progressives SHOULD NOT let the infrastructure bill pass and should not be afraid of being blamed for any projected election losses.
If Democrats are willing to run on next to nothing, they might as well have to run to run on absolutely nothing at all. That might just terrify the moderate Dems enough to get them doing something the American people overwhelming support. If it does not terrify them then they might as well be retired by their evil Republican opponents.
P.S. Kamala should be living on local televison in all the red states. Democrate have totally underestimated the power and value of exposure on the local news in rural states. She could scare the shit out not only Manchin and Sinema but also every Republican up for re-election. Should have been there all along.