I think you are right, that some liberals often disagree with one or more liberal lies... But they have to participate in the lie anyway, to support the “good guys”.
There have been calls to rewrite American history so slave owning capitalists like Washington and Jefferson do not appear. “To have an American history we can be proud of.”
I don’t think socialists wrestle with moral dilemmas regarding the truth, not the truly converted. They recognise truth is the enemy from day one. They don’t skirt the truth, they purge themselves of the truth, they can’t write their “new truths” for all of us without wiping their moral slate. I liken it to how converts to Satanism are initiated by writing and reciting the Lord’s Prayer backwards to “free themselves” before they take up their new religion. It isn’t a different view of America, it’s reversing America until everything that made us America, is dead. Clean slate.
Because their Utopia cannot safely exist while there is anyone who remembers or is able to discover what America was.