A core belief of Conservatism according to Bill Whittle is that they "don't think people are perfectable", that people are "motivated by their own self-interest", and that human nature is fundamentally flawed, selfish and unchangable. That is indeed pessimistic and cynical.
Then Whittle explains that it this belief (that human nature is fundamentally flawed, selfish and unchangable) that generates a society with the checks and balances against the natural human bastardliness that basically wants to tell other people what to do. [1:48-2:03]. That seems logically inconsistent. It is that type of personality that results in oligarchy, or a corrupt system that benefits a few at the expense of the many.
Compare that philosophy with the preamble of the US Constitution. Clearly the Tea Party/Conservatives are at odds with the Constitution and the thinking of the founding fathers, who wrote "We the People of the United States, in Order to form a more perfect Union, . . . " I guess the founding fathers were a bunch of flaming liberals.
Selfish goes well beyond self-interest. Selfish means that one is "concerned excessively or exclusively with oneself : seeking or concentrating on one's own advantage, pleasure, or well-being without regard for others."
http://www.merriam-webster.com/dictionary/selfish
http://en.wikipedia.org/wiki/Selfishness
And this is the kind of person Whittle proposes to run the US government.
I was taught to be concerned about well-being or welfare of others!