Black Americans are more likely to be shot by police than white Americans:

https://www.washingtonpost.com/news/post-nation/wp/2016/07/11/arent-more-white-people-than-black-people-killed-by-police-yes-but-no/?utm_term=.450eeae48242

I don't think your characterization of the US is factually correct, though it depends on how one defines freedom and "true" equality. US history has been defined by tension and conflict between its ideals (as enshrined in the Bill of Rights), versus our failure to live up to those ideals (e.g., slavery; women's exclusion from voting; etc.). 

But in any case, the freedom to protest inequality is much more important - and in keeping with liberal democratic ideals - than flag fetishism.