You're correct, most American schools have an ironically lackluster presentation of MLK. The Kingology is usually just enforced with a general "blacks are now legally equal" without any context, and his "murder" by a white man served as a good segway into the next stage of our Negrolatry, where changing the laws wasn't good enough and whites will always impede blacks in the US, if not by law than by social pressure and treatment. The conclusion isn't too hard to understand, if we can't be equal, one side has to go.

On a related note, Malcolm X was a much better black rights activist, who was not an astroturfed meme, and the blacks ended up killing him. He doesn't fit into the liberal narrative and is largely expunged from the American mythos, but he has more of a right to the throne MLK sits on in our history.