Let me rephrase what I wrote:

But then I realized that by its name the subject of that thread was limited to a discussion about why there was little if any protest singing by folks who participate in African American protest marches and rallies.

-snip-

That is still a poorly written sentence since I wanted to convey that non-African Americans can and do participate in "African American" protest marches and rallies. But I think it's an improvement over my previous one .