American exceptionalism is probably responsible for more deaths in the past couple centuries than all but the most brutal dictators (excluding natural factors like disease, natural disasters, etc.). It's unadulterated, unfiltered, and unabashed hubris in its purest form. The idea is anathema to any kind of unity that humanity might try to achieve. It is probably the largest impediment to global progress, other than natural resource limitations. If American exceptionalism were an individual, that individual would surely be a sociopath. Imagine that sociopath with the financial, technological, and military resources that America possesses. Frightening thought. Especially for those that get caught in the crossfire of our petty political games.