These two comments: > topics that get rehashed over and over again with the same arguments are off-topic, ane > something on WWII, it could still be relevant

These two comments: > topics that get rehashed over and over again with the same arguments are off-topic, ane > something on WWII, it could still be relevant as general interest, even if it's old. I really don't see how you reconcile these into any sort of objective principle. How about this: "It's relevant if I say it is." That's perfectly fair for a private group; just say it.