Well, in an ideal sans-opposition scenario, of course.
I'm all for reservation and "cooler heads prevailing", but seriously, there comes a time when you need to fight fire with fire. The Roosevelt Administration didn't get the US through WWII with harsh words.
Oh aye, there are a reasonable number of countries in the world we couldn't do that to... immediately. There's a smaller list of countries that it would take years to reduce to that level, and things would probably go nuclear if that happened.
But for the most part, give us a few weeks to months to establish air superiority, and most countries would find themselves wondering what the fuck happened when a few hundred B-52s show up for a little barbeque.
All in all, it's a tricky business, and the sort of "asymmetrical warfare" we're currently dealing with makes it considerably more complicated.
The "soft touch", so to speak, that the US has been employing thus far tends to embolden our enemies. They know that we'll hesitate to attack them when there is a high probability of civilian casualties. They know that there are
things we won't do in order to beat them.
Ultimately, the way I see it, there are two options in fighting a war like this, and we're not really pursuing either of them.
On the one hand, you roll in with overwhelming numbers and unlimited
restraint. You re-establish any and all services that were interrupted by the war as close to
immediately as is humanly possible, and then proceed to
make improvements on the lives of the citizenry, all while defending them and yourselves from the attacks of extremist nutjobs.
This, in my opinion, is what we
should have been doing from Day 1.
The second option is... more direct. You invade, again with overwhelming force. You also send out any patrols in overwhelming force, and if anyone attacks you, you treat it precisely as you would if you were under attack by a military force of unknown strength. Which is to say with overwhelming firepower and less-than-discriminate targeting for the most part.
This option can work, but is more reliant on breaking the will of the populace through negative means, and as such considerably less consistent.
The two approaches have the same goal: to make the general populace understand that it is in
their best interests if your forces get to do whatever it is that they came to do in an unmolested fashion. You are, in both instances, breaking their will to resist the occupation, and encouraging them to
police their own populace.