Today I read Tyler Cowen, one of my favorite libertarian blogger post this:
My colleague Dan Klein continues his pathbreaking work on the sociology of the economics profession. He asked petition signatories why they favor increasing the minimum wage. The results are striking, most of all for how far they stand outside traditional economic reasoning...What follows is a list of comments by lefty economists where they argue for raising the minimum wage on normative - not economic - grounds. Very few of them make any kind of economic argument at all. Most of them make arguments concerning a desire for equality.
It seems Cowen is jumping from "increased economic output is what we usually study in economics" to "if you concern yourself with other things than you are acting contrary to economic thought". This kind of thinking is just pernicious.