David Simon:

Why not? Because just as good cannot be truly understood to the marrow without a corresponding sense of evil, pride in one’s country — if it is substantive pride, and not merely the rote, pledge-allegiance mouthings of patriotic cliche — requires the sober knowledge that American greatness is neither assured, nor heaven-sent. It comes to us from our national premise and ideals — and our willingness to maintain those things at all hazards. And if you’ve never felt ashamed for us for having strayed from our core values in even the most appalling ways — say, the wartime detention of Japanese-Americans, or a My Lai or Kent State , or Bull Conner, or COINTELPRO, or life sentences for juvenile defendants, or prisons-for-profit — then maybe you’ve never really acknowledged what the actual stakes are for a republic, or how much work, rather than platitude, is required to assure an honorable, democratic future. Yes, you claim an all-encompassing pride and you wallow in it, brooking not even a mention of anything shameful that happens on our watch as citizens. But in fact, real pride is earned and internalized only with a grown-up understanding that even a good or great nation, while deserving of our allegiance and civic commitment, can indeed shame itself. Saying so when it happens is a fundamental of self-governance, as all dissent is a fundamental of self-governance.

-- http://davidsimon.com/doubling-down/