In an interview for the October 2011 issue of Ebony magazine, Bill Gates makes it clear that he is none too happy about the state of public schools, namely those in inner cities. He points to it being a civil rights issue. And he wants to know why a strong social movement - especially in African-American communities - hasn't successfully mobilized. He is flummoxed as to why we aren't all expressing the same outrage and rising up against the status quo.
There's only an excerpt of the story online. You have to buy the magazine to read the rest.
In the meantime, you can read more about the issue on the Bill & Melinda Gates Foundation blog.