Let me share the perspective I have as a member of a class of people that have been subject to racism for thousands of years, including enslavement, arbitrary murder, and systematic mass murder. Please forgive me, but being quiet didn't seem to work so far.
At least hundreds of thousands of polite, quiet, reasonable, assimilated urban Jews were murdered in the holocaust. It is deeply wrong that African Americans and other minorities or mentally ill people live in a world where the police can be every bit as dangerous as the gestapo. I feel like it's wrong that millions of women have been murdered simply for not doing something a man wanted. Millions or billions of women aren't treated as if they have the same value as men.
Please look at the bully pulpit standing against us. Most of the power in American society is concentrated in the hands of a very few white men. How loud do you think someone has to be when they have to stand against the megaphone of society? When someone needs to stand up against trillions of dollars in wealth?
Pretty loud as it turns out!