About the only justification is if the member didn't know it was fake. Personally, if I passed off a fake by mistake I would want to know about it ASAP. As for the topic at hand, I would just tell people I knew that were going abroad to not purchase any cuban cigars period.
Not to completely thread jack, but as I said, we're supposed to know better. Trust but verify, know your sources, etc. And the last thing I'd do would be to gift or trade a stick where I had < ANY > questions about the smoke's authenticity. There are lots of guys in these forums that know how to tell the difference, the resources are available. IMHO the SS needs to be notified, not burned at the stake. But, notified, to be sure.
And yes, I tell people traveling abroad that there are more fakes in circulation than the real article, and if they are casual or infrequent smokers, I'd tell them where to go and what they should expect to pay. Usually I tell them the risk of fakes, even for someone with some experience, is too high and not to bother. Appreciate the gesture, of course, but please don't waste your money, etc. Hey, I'd want to know.....