Originally Posted by
Chubark
A point everyone seems to be missing in here:
The entire Rogue Class Hall storyline revolves around the fact that, before the Broken Shore, Shaw of the SI:7 actually sent scouts to the Broken Shore to analyze the situation, whom the Dreadlord Detheroc murdered, kidnapped Shaw, and assumed his place while spreading misinformation about the Legion's defenses to the Alliance. After the Broken Shore, he fed misinformation about the Horde directly to both Anduin and Greymane, intent on setting the two factions against eachother.
That fact only fueled Genn's hatred against Sylvanas, which, along with most likely having a hand in posting Sky Admiral Rogers on the Skyfire, only served to ignite the fighting in Stormheim. Which, even though the Legion was behind everything, is an act of war.