Sure, we've all seen stores and restaurants play up holiday sales for the sakes of their bottom lines. But there are times when someone with a decent head on their shoulders should speak up and call a bad idea a "bad idea."For instance, when the country is celebrating the birthday of, arguably, the most influential civil-rights activist, Dr. Martin Luther King Jr., boasting a sale with "20% Off All Black Products" is about as bad an idea as bad ideas go.