I don't think it would have been possible for them to have all been oblivious to the Horde's intention. There were some who clearly harboured and supported them, but as a unit they refused to cooperate in any kind of investigation or assistance. They made themselves wholly complicit, and left Jaina with no choice but to clean shop.
Fair point, but we really don't know enough about Modera specifically, at all to know how she stood on the matter. We know she's actively fighting Sunreavers now, so she can't be that outraged.as for modera...they really don't have to fully agree with the decision in order to support their group after its been dedicated to a course of action, there's a big difference between being angry and dropping all support in outrage.
One can only assume any misgivings are overidden by Krasus's prophecy that Jaina would ultimately come good.