Matt Patterson, Founder and President of 1st Amendment First, had an article published in American Thinker on September 5, 2016, about how liberals ignore economics, human nature, and history:
It’s easy to be an American liberal. All that is required are hypocrisy and ignorance.
Ignorance is an absolute must, but especially ignorance of three things: economics, human nature and all of recorded history.
One has to be truly economically illiterate to believe that high taxes encourages productivity, that union-imposed labor regulations don't dis-incentivize hiring, that energy regulations don't raise prices on the poor and working class.
Likewise, to be a liberal you must pretend that men and women are exactly alike in every respect and that communism produces the most happiness for the most people.
Of course you can search the history books in vain for a communist society that did not produce poverty, misery and/or death on vast scales. But American liberals don’t read history books – just note the vast throngs who came out to support Bernie Sanders for President of the United States.