Good Grief Man! That is just the point!
They are now and they have not been fighting each other, they have, through the daily preaching of their jihadist mullahs and their islamic leaders been shifting their anger to us!!!!!!
They use our support of Israel to re-direct the hatred away from their raunchy government and toward us.
Do I need to go through the historical proof by re-stating the long chain of events, culminating with 9/11/2001 in order to open your eyes?
We will no doubt be fighting this war for a long time. Not just Afghanistan and Iraq, but we have forces in the Philippines now and we will likely take on Syria, who's invasion of Lebanon and the bombing of the barracks many years ago signified the beginnings of this long and sordid tale.
Hell no, it is not the end of the conflict, but it is just the beginning! Get used to it! We will kick all their goat stinking asses if need be.
Our children and our children's children will finish the job. This will definitely last for more than a generation.
Not really.
You just need to keep your own eyes open for what happens during the next five years or so.