Important point — the lack of historical understanding is depressing and dangerous. Even in the face of Justice Scalia’s death, we had Republican leaders almost immediately saying that standard practice is to not confirm Justices in presidential election years; that was disproved very quickly by simply running through the history. We have reached a sad point where politicians can willfully lie (or simply be too lazy to check their facts) about history to justify their agenda (and in the case of many voters, they seem not to even care).
One person I have liked on this is Bryan Stevenson. While this is not the main point of his talks, this idea of remembering our past is something he brings up time and time again as he writes about injustice in the criminal justice system (for example, contrasting the way Germany has dealt with its horrific past deeds to how America has not really engaged with its racial legacy).