One of the problems with local control over education is that a bunch of people with an agenda can insert/delete things from the curriculum, whether or not they have any credentials. People may object to "government control" but what they mean is federal government - they want the power to be in the hands of local communities. Which is fine if all local communities are responsible. The problem is, when there are no national standards, kids who move from one state to the next are not prepared for a new school, and they fail.
We also have an entire generation of kids who are missing key skills, are incapable of writing in sentences, are missing critical thinking skills, and are unprepared for college and the workforce. Colleges are teaching remedial English to kids born and educated here, but who cannot write coherently or read with comprehension; colleges are teaching middle school skills. High school and college graduates do not have any consistent or minimal level of skills, and suffer in the job market.
While I am not in favor of "teaching to the test" because I think so many kids learn differently from others, I do think there's a place for minimum standards. And when we see a huge lack of basic literacy, knowledge of civics and history, and math skills, we have an entire class of uneducated voters who don't understand the structure of government set up in the Constitution. Most native-born citizens cannot, for example, pass the citizenship exam we require of immigrants! (Try it yourself - it's available on line.)
It's much easier for people with an agenda (racist, religious, philosophical, whatever) to institute their priorities at the local level, and that's usually done with a whole lot of "anti big government" hysteria. That doesn't mean it's easy to establish and implement a national standard - it't not. And there are so many teachers who are not equipped to teach, it's hard to implement even a perfect curriculum.
Everyone's going to have problems with a standardized, national anything. But I agree with you that it's easy to be anti-standards when what people are really ticked off about is a black president. So you're wise to question motives here.