Your call, but I would point out that Rae himself had a heavy presence on those threads about him that featured on this art forum. His own input to these threads pretty much damned him by his own words/responses. As such, all first hand, not hearsay.
Personally, if it stops someone from getting scammed to the tune of 20k on a lightboxed Steranko (or lesser-priced phony Kirbys), I would have no hesitation chiming in with appropriate warnings to fellow collectors.
Even if you didn't want to personally engage Rae, maybe a few links to various threads wouldn't have gone amiss.
Heck, point me in the direction of the FB group and I'll do it myself.