You just don't really see many Mormans in NYC.
That's because they look just like everyone else. Only the missionaries standout.
The vast majority of Black LDS I know are from Africa or first generation African-American.
Premier, DOMS, bio-chem and I spent much of our lives involved to a degree with LDS society/beliefs. We are familiar with the beliefs and what lies at the heart of the culture.
Why someone would listen to hate speech bread of ignorance and disregard those who were raised in or around the LDS is beyond comprehension. Who do you think provides massive relief efforts when disasters happend? You are right that much goes on behind the scenes. Great acts of service. It may involve two people or two-hundred thousand. I've seen marvelous works of charity and goodwill touch the lives of many because of the strong faith of many LDS.
The prop 8 issue was a challange for many. In the end, the people of California made their choice, and "Mormons" were a minority of the voters. The liberal idea that everyone who votes "conservative" on "moral" issues must be brainwashed is a terrible insult to the American people.