Yes, wipe everyone's memory and then try?

Wipe out every inhabitant, then try?

I don't know how we can do it and nor does anyone else, as far as I can see. We're humans: we're chained by our memories. Cats soon forget that you trod on their paw while you were trying to avoid them as they dodged around on the stairs. We don't.

Yes, discussion would help - but not if one or both sides is utterly intransigent and prefers war.