What's the problem with Martin Luther King Jr? He advocated for civil rights for blacks. How is that a bad thing? The fact that the black community is largely unambitious, has inflated notions of entitlements, has not valued the importance of the family to any degree, and has a strong current of anti-Semitism, is undeniable. Is that Martin Luther King's fault? He wrote that anti-Zionism really is anti-Semitism, so I don't think he would have shared in the anti-Semitism of Louis Farrakhan or Jesse Jacson.
I don't think he is worthy of a holiday; there are plenty of more deserving people, but what is the reason for all of the venom?