So why are they lying to you? Guilt, shame? Stupid?
No, because THESE NARRATIVES they're pushing A) allow their rich donors and members of the ruling class (of which most of the party leadership belong to) to collaborate with fascists and retain control over the OPPOSITION to Trumpism, despite the fact that they've lead you to ruin.
If they ADMITTED they blew it by appeasing nazis, you'd demand people be fired and would turn on anyone COLLABORATING WITH FASCISTS for profit.