Also not the poster, but study after study finds that education and income inequality is correlated with everything from crime rates (unsurprisingly, poor people are more likely to commit, or at least get caught committing, crimes) to mental health (the less money you have, you are likely to be mentally ill and less likely to have access to good care). Then there's obesity (again, the rich are more likely to eat healthy food) and other similar physical health issues.

Some of that is a consequence of education (for instance, nutrition) or income (mental illness) but all of those are seriously worsened by inequality resulting from our education system. If you're interested, The Spirit Level (http://www.amazon.com/The-Spirit-Level-Equality-Societies/dp...) and Ill Fares the Land (http://www.amazon.com/Ill-Fares-Land-Tony-Judt/dp/0143118765...) both contain great discussions of this.