And why the bleep wouldn't they?
I think the answer is because the Democrat elite think little of America as an ideal and Americans in general.
They are Internationalist Socialists and think real American sentiments, religious beliefs, and natural rights are an embarrassment; rather than an inspiration to the world, and often the actual physical salvation of this world, demonstrating that there is an escape from the nightmare and tyranny of the absolute government control that Socialists espouse.