Ivor, you sound eager to debate, and "debate" is not what happens in relation to deniers. They have a closed opinion, and it is not given to you to open it. You say you wish not to show your hand, but as soon as they notice that you're a Jewish person, that will have happened.

I'm on your side in the argument, but I feel a though you're expecting to "win" something. If you don't look closely at the playing field of the "debate", you won't notice that there's no win possible, except to deny the deniers the attention that they crave. Engaging on their terms is to have lost what you wish to win.

Perhaps you're asking something about how to address the issue effectively?

Sincerely

Meg