"I don't want to show my hand in advance, but I have the start of an approach where I won't be offering facts, evidence or logical argument."

Well if your going to offer up yourself, you might want to think about what happened to the guy who tried it a couple of thousand years ago.(arrh)

If you aren't going to offer up proof, what is left, Faith?

I think all you could debate is the number of lives that were taken, and we'll never really know the extent of any of history's genocides.
Is there anywhere on the planet, at any given time in our history, where man has not tryed to wipe out entire races or enslaved them?

The question shouldn't be "if" it happened it should be "why" it happened!