The idea of weeding out imperfect humans to develop an ideal race has been around for quite some time, writes Bill Muehlenberg.Margaret Sanger(1879-1966),founder ofPlanned ParenthoodMost people know about Hitler’s plan to create a master race and to weed out the unfit and inferior races. His horrible plans resulted in World War II, the deaths of millions, and the Holocaust. His notions of racial and national superiority did not come out of thin air, however, but were based upon ideas and practic…