There are many ways to learn about the bleaker aspects of human nature. One would be to run a pizza shop or have to clean regularly a public restroom. Perhaps close attention to the text of Thucydides might give a more abstract lesson of what people are capable. The Old and New Testaments offer plenty of examples of the fallen state of man.
Obama apparently did not get the message. What is the common denominator to his failed foreign policy initiatives — reset with Russia, a new, kinder gentler Middle East, supposed breakthroughs with China, outreach to Iran, Cuba, and Venezuela — and his domestic catastrophes: Obamacare, deficits, huge debts, or chronic unemployment?
In a word, he does seem to know much about human nature, whether in the concrete or abstract sense. Obama either never held a menial job or ran a business. In lieu of education in the school of hard knocks, he read the wrong, if any seminal, texts at all.