I suppose the problem is human vanity. It would never do, without gloating, just to quietly take him out. Then too, this act may have been counter counterproductive, we will never know now, if it were possible to continue observing his every move and communication. Sadly, this won't end terrorism, hardly a dent really, and could make it worse.
We are pursuing the same policies that have proved so spectacularly unsuccessful for the Israelis for the past 50 years. Not being insane, so far as I am aware!, I would anticipate a similar outcome for the USA, i.e., we will still be arriving an hour early and taking our shoes off at airports fifty years from now, and still squandering billions that could have been put to useful purposes. With our help, this master terrorist will have achieved his goal of ruining the U.S. economy.
But admittedly I makes one feel good for the moment that this bastard is gone.