Something tells me you know bugger all about the history of the rise of the Horde. Such as the fact that the orcs didn’t know about the legion or even that the Cup of Unity was demonblood. They didn’t even know or understand what Fel was. KJ spent the whole time faking that the directions were coming from the orc’s ancestral spirits. It would be like if Elune turned up in the flesh waving around full credentials to prove she was Elune and told the NEs that the Tauren were a threat to Kalimdor that had to be removed.
One of the reasons Durotan was assassinated was he realized Gul’dan and Blackhand were taking orders from demons.
The great irony is the ‘warning’ that started the orcs warring against the Draenei is that the Dreanei and their magic was a threat to the future of the Orc race and the planet and, ironically, in AU Dreanor it turned out to be true.