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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.
If you can't fill in: "don't support X or Y but ___" then why make a comment tearing down any particular candidate? You're clearly not interested in what's possible in our current, real-life political environment.
If you're positive it's impossible to get anyone decent elected then go set something on fire or some shit. I'm not judging any radical position but we're talking about ballot boxes here.