The ever-wise and usually right Paul Krugman assesses human behavior. He begins with this, but click the link and read it all. It’s brief.
My sense, after 11 years of punditizing, is that people are complicated, but gangs of people less so. Individuals are often mixed in their behavior: incorruptible politicians may cheat on their spouses, political scoundrels may have impeccable personal lives. But groups, like a politician’s inner circle or the management team of a media empire, tend to behave similarly on multiple fronts. If they lie and cheat routinely in one domain, they tend to do it in others as well.