Every January, our nation celebrates Martin Luther King Jr. Day, and every February, during Black History Month, we contemplate his words of nonviolent resistance and how the practice of that philosophy brought about the civil rights movement. Leaders, both black and white, rightly venerate him, but somewhere along the way, his message has been corrupted or outright forgotten by some on the left. Over the weekend, longtime Rep. Maxine Waters, D-Calif., called for disrupting and...