Economist.com | Lexington: It is not just black leaders who are failing to hold young blacks to higher standards. It is America in general�and, above all, the educational establishment. Teachers are far too willing to make excuses for black failure, and universities have institutionalised low expectations through affirmative action. Why should black children try as hard as their white peers if they can get into college with lower marks? There are some signs that America is trying to tackle what George Bush once described as �the soft bigotry of low expectations�.