Because that's not how the game works.
The common man is like a worm in the gut of a corpse, trapped inside a prison of cold flesh, helpless and uncaring, unaware even of the inevitability of its own doom.
Because nobody is that strong in wow no matter what those bullshit books say.
Azeroth is a world full of contradictions its a world where they have invented fucking machine guns and all sorts of artillery but still soldiers carry swords and shields. Christ i must have obliterated 100s of ally soldiers during this one quest alone http://www.wowhead.com/quest=28591
They have huge fucking airships that carry huge fucking daisy cutter bombs but never deploys them they have invented the internal combustion engine and fucking helicopters and planes but still use fucking bats and gyphons.
People weld magic and can summon shit out of thin air but they have a resource problem Hell FUCKING MAGES CAN SUMMON FREE FOOD FROM THIN AIR but people are starving.
Need i go on?
i think its like asking why didnt horde use bilgewater cannon to obliterate stormwind
I just want them to use that super cannon in Bilgewater that's pointed at Stormwind!
Because Jaina has very important hiding to be doing. Like she has done since her introduction in wc3
Naftc, "Hunters are the cheapest class in game and when played right are more deadly than a train plowing through a field of bunnies covered in napalm"
Also I can't help but wonder why Shandris Feathermoon isn't along side Tyrande.
on topic : Pretty sure that Jaina's blue dragonflight boyfriend managed to talk her down from drowning Org. Also the water elementals couldn't hear Thrall.
I'm more offended that Thrall didn't let me vote our new warchief ..... I'd vote Sylvanas, Vol'jin or Baine (Have no memory of his name)