I think people are getting way too worked up about this. What's the big deal if Hermione is black? Yes, those two quotes about the white face and looking very brown make canonical support for black Hermione a bit tortured, but frankly using those two to say that black Hermione is definitively ruled out by canon is also overdoing it. JKR hasn't said in any of her statements that Hermione was always black, which would be ridiculous. She's just saying that there is some wiggle room to interpret that way while technically remaining within canon. Fans wondered what her opinion was and so she provided it!
Agenda? First it's political correctness and now she has an agenda? What may that be?
Nobody could really care less if she is or isn't black. The fact is that the book was originally written with her as a white girl. The fact that Rowling feels a pressure to portray her as a black, against the original reality, is what is bothering people.
This is the same pressure that people feel to ignore black on black crime, in fear of looking racist, or the fear people have of pulling over a Muslim in the airport, as not to look like a profiler. People just want to forget what color they are.
Whether a black person shoots a black person or a white person shoots a black person, a person shot a person. Why do black lives only matter if it was taken by a white? Lives matter, period. College acceptance should be based on most eligible, regardless of ethnicity, religion, color, and gender.
Affirmative action, otherwise known as reverse racism, is what is bothering people for the same reason that racism should. The dream equality is being quashed by this, as is basic safety. People just want to ignore people's color and judge then based on the person they actually are, but these activists aren't letting that happen.
People are still being discriminated based on their color. If Hermione is white, let her stay white. Why is that a crime? This is what's bothering people.