I don't think Steve meant that at all. I think he was more emphasising the fact that although we wish to observe the horror of Auschwitz, genocide has reappeared all over the world. The actual differences of opinion have largely been on the issue of degree and emphasis. Nobody here is trivialising the monstrousness of what the Nazis did (with one obnoxious, anonymous exception).
I don't know whether I will eventually decide that Auschwitz was unique in its scale in the history of inhumanity. I see no harm in discussing the issue though. I have learned something from reading all the better tempered posts here. May it continue.