The new visual guide has little sections dedicated to each of the main characters of the playable races. The BE one covers all of their leaders, and mentions the purge in both Rommath and Aethas's bios. Relevant bits:
Originally Posted by Aethas SunreaverBit curt, but still. This isn't player inferences or guesswork; it's Blizzard themselves saying both of them had pretty natural reactions to the purge, and I don't think it would be written so plainly if either was complicit or responsible for it. Optimistic, enthusiastic and outgoing champion of neutrality Aethas is actually an evil pawn of Garrosh? Rommath, whose loyalty is to his people first and foremost, would get them killed in an elaborate power play? I don't buy it. Especially not now.Originally Posted by Grand Magister Rommath