Teaching about MLK is not social justice. It is history. I believe history should be taught in all schools, but it is not taught well in a lot of schools. Or it could be that it was taught but not in a manner that had a lot of impact on the students so it was forgotten. That is no different than kids that said their previous year's teacher didn't teach long division when you know that it is not accurate. I see the discussion about teaching "social justice" as much different than teaching history. "Social justice" has moral connotations to it and can be misconstrued in many ways to suit an agenda. It easily could contain ideas not supported or agreed upon by many. I would like to understand what you mean when you say the term social justice.