American Exceptionalism, and the belief of the United States superiority and infallibility, is built on quasi-religious beliefs. The holy documents include the Declaration of Independence and Constitution. Those that follow it hold up the founding fathers on pedestals and work to cover their negative attributes/sins (being and benefitting from being slave owners, many having adulterous affairs, etc.) To not hold such pride is to be unpatriotic according to followers. Heresy and blasphemy which should get people kicked out or killed.