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https://en.wikipedia.org/wiki/Thought-terminating_clich%C3%A9
As the party fielded more and more candidates who championed economic-right policies in order to attract corporate donations, the idea of "purity testing" was turned into a stock phrase to attack critics using labels, instead of justifying it on its own terms.
Phrases like "moral purity" now serve two functions: firstly, to dismiss criticisms from the Left wholesale without having to discuss them directly, and secondly, to blame them for the rise of fascism.
In theory it was also supposed to serve a third function of bullying the Left into voting Democrat, but that didn't work.
Who is "us", are they supposed to reach through your computer screen? I've done activism on and off for years, every time I put in the effort it yields results from the Dems, left leaning or not. If you want our side to win, you have to put in the work. You can't expect the Dems to work with you if you're not along side them doing the work as well. Your responsibility doesn't start and end at the voting booth.