Surely "kicking some major ass" implies a battle against someone of comparable size and strength? The Taliban regime doesn't measure up to that.
The eminent miltary historian Professor Sir Mucharl Howard recently camed up with a memorable and thought provoking image recently, when he described the bombing of Afghanistan as "trying to eradicate cancer cells with a blow torch".
Here is an article containing what he had to say.
And here is a recent article from The Washington Diplomat which puts Sir Michael into context - he is no pacifist lefty by any means. I think what he says deserves to be pondered very seriously indeed.