TOMORROW MARKS the second Holocaust Memorial Day, to commemorate the millions who were murdered between 1933 and 1945 simply because of who they were. It is important that we remember all those who died - both the six million Jews and the five million non-Jews who are all too often forgotten when the subject is discussed. In part this is a question of common humanity; the Holocaust of 11 million shows we are inextricably linked, caught, in the words of Martin Luther King, "in an inescapable network of mutuality - whatever affects one directly affects all indirectly". But it is also something which we Jews need to do to avoid the trap of allowing our Jewish identity to become …