You remember Colin Kaepernick, right? When he used to be a football player he took a knee for a cause, and after hanging dormant for the better part of a year, his knee has taken on a new life of its own, has become the catalyst for words and actions and tough talk and hurt feelings and harsh realities and, maybe, liberating ideas. In all this dust-up we can’t lose track of the knee. We mustn’t let the subject be changed, the agendas that come from the mouth can’t be allowed to overpower the knee.