Well actually, I know he isn't, b/c I remember when he tried to enlist, and I also believe he sincerely wants to kill Chinese people.
Anyway, as for the policy shift, is this really new? I mean, wasn't this pretty much the deal with the last SOTU address? Ya know, terrorism and tyranny can't exist where democracy and open markets take their place, etc. etc....?
I read a piece in Current History magazine last year which pretty much made the same point. Attacking Afghanistan seemed like a good idea, but it basically scattered Al Qaeda across the globe, and thus allowed every crazy jihadist movement to fall under the "Al Qaeda" umbrella. The comparison this historian made was that of a bulky and beaurecratic corporation essentially turning into a franchised brand name of sorts.