I’m confused, doesn’t what you’re saying apply just as much, if not more, to Democrats that some of the progressives reluctantly do end up supporting and voting for despite knowing from their explicit policies and if a career politician, voting record, that they’ll barely represent them? What do those longstanding Democrats expect when they continue to betray, or clumsily compromise away, those positions or policies that more progressive demographics voted them in to office hoping they might defend, or at a minimum compromise on in a way that is in fact progressive and beneficial to folks?

On that last point, you may argue they do that, but I’d argue that those cases are rare, and instead they more often compromise in such a way as to either hand more over to their opposition, or make moves that are more of a temporary provision that may be cast aside with the next majority and/or administration.