US playwright David Mamet. I suppose after Oleanna this was always a possibility.
"How could I have spent decades thinking that I thought everything was always wrong at the same time that I thought I thought that people were basically good at heart? Which was it?
I began to question what I actually thought and found that I do not think that people are basically good at heart; indeed, that view of human nature has both prompted and informed my writing for the last 40 years. I think that people, in circumstances of stress, can behave like swine, and that this, indeed, is not only a fit subject, but the only subject, of drama.
I'd observed that lust, greed, envy, sloth, and their pals are giving the world a good run for its money, but that nonetheless, people in general seem to get from day to day; and that we in the United States get from day to day under rather wonderful and privileged circumstances—that we are not and never have been the villains that some of the world and some of our citizens make us out to be, but that we are a confection of normal (greedy, lustful, duplicitous, corrupt, inspired—in short, human) individuals living under a spectacularly effective compact called the Constitution, and lucky to get it.
For the Constitution, rather than suggesting that all behave in a godlike manner, recognizes that, to the contrary, people are swine and will take any opportunity to subvert any agreement in order to pursue what they consider to be their proper interests.
To that end, the Constitution separates the power of the state into those three branches which are for most of us (I include myself) the only thing we remember from 12 years of schooling.
The Constitution, written by men with some experience of actual government, assumes that the chief executive will work to be king, the Parliament will scheme to sell off the silverware, and the judiciary will consider itself Olympian and do everything it can to much improve (destroy) the work of the other two branches. So the Constitution pits them against each other, in the attempt not to achieve stasis, but rather to allow for the constant corrections necessary to prevent one branch from getting too much power for too long."