The prog-libs want it both ways as they talk out of both sides of their collective mouths.
On the one hand, they believe in manipulating social behavior through gov. spending and tax policy when the behaviors they want to change suit their agendas, but when it comes time to acknowledge the facts about the connection between tax policy and revenues, they deny that same connection.
They live in a Keynesian fantasy land where wealth and value have no connection to the reality of human labor, time, and motivation.
Prog-libs simply cannot face the truth of human nature because it would then mean facing their own petty, selfish selves.