Part of the issue with voters is that youre insisting they carry some kind of duality of having sincere political and partsan beliefs and then disposing of them at the drop of the hat to win. And not knowing what will and guessing based on polling, and then losing anyway.
Despite the argument about 'getting what they want exactly' and holding out if they dont, almost all electoral participation is a leap of faith where nobody gets what they want...but their faith isnt utterly humiliated along the way. It kinda is now. The vector and thrust are not going the same direction. As much as this framing might piss everyone off, faith/trust/vector/thrust elementally matter no matter the arguments.
This is why one of the other planks of Democratic Party outreach, highlighting deliverables and objective fulfillment falls flat no matter how much they do it - theyre highlighting how much youll never get what you want and should be fine with that, because look over there at that!
One of the funnier asides is that Democrats need voters to be sophisticated enough to reject the GOP, but not so sophisticated they question or lose faith in the party.