I'm well past ascribing that to ignorance, it's malice. The consequences they talk about arent' the consequences they want. If your sole goal is power over all others, then it's easiest done if all others are totally impoverished.
They did it before when the USSR broke up. The talk was of worry about the 'ruble overhang'. Common folks had saved up rubles, as there was not much to spend them on. So TPTB redefined the ruble to smash the savings, and so could pick up ownership of the now-privatized national wealth for pocket change.
However, the lib rank and file are too ignorant to know that their leaders are lying to them about the Laffer curve. Also, the lib R&F believe that the policies of the lib elite will actually generate the consequences promised to them.