And yet, there's several quests that make it clear that Theramore was directly supporting the Alliance, in the form of both supplies and reinforcements. It must be convenient for Blizzard to be able to backpedal in quick QA sessions.
The point isn't that Theramore was an aggressor. It's that Jaina loved to talk big about her (and by extension, Theramore's) neutrality until the moment she had the opportunity to aid the Alliance. It was the same when she was in charge of Dalaran.
In case it's unclear, I'm not arguing in favour of the use of the mana bomb, only Theramore's validity as a target.