“The crucial question is not whether evils exist but whether the evils of the past or present are automatically the cause of major economic, educational and other social disparities today. The bedrock assumption underlying many political or ideological crusades is that socioeconomic disparities are automatically somebody's fault, so that our choices are either to blame society or to 'blame the victim.' Yet whose fault are demographic differences, geographic differences, birth order differences or cultural differences that evolved over the centuries before any of us were born?”