In the late 80's and the 1990's Air Force Space Command took over USAF space launch activity and asserted that sicne they were an Operational Command they should do things like an Operational Command and discouraged the traditional engineering approach. They reason was simple; they had lost of pilots who no longer had cockpits and missile crewmen who no longer had silos. In 1998-99 three out of four Titan IV missions at Cape Canaveral failed; every single failure was found to be preventable. A former CSAF was brought in to study the situation and summed things up simply, "We used to be able to do this mission but now we no longer can. You put the wrong people in charge. Fire the ones you have in there and go rehire the ones you fired."
If they think that percentages of races are a problem, over and above quality of the force, we once again have the wrong people in charge.