> The march on Washington during WW II was by Rabbis and was for a very different purpose. This rally is sponsored by secular organizations
Exactly, during WW2, those non-observant Jews were afraid to show up and even counseled FDR to disregard the march. Can you imagine how those Rabonim felt being abandoned by fellow Jews in trying to save Jewish lives. Now, those other Jews finally showed up and we are now nitpicking on the speaker lineup.