Yep: Basically, commit cultural and societal genocide. This was done all the time during ancient empires and civilizations. How many cities and areas that we know of were once of different names, religions, cultures, and peoples that we don't know of? Hell, we only know of the Etruscan civilization because of it only being mentioned a few times in Roman history, and their language becoming integrated into primitive Latin. Otherwise, we'd have never known of their existence.It might. But that would never be allowed by the people back home or the international community.
Fact is the Coalition was NEVER going to succeed at making liberal democracies out of these places unless they were willing to do what Hadrian did in Judea. They went in thinking they could do what was done in Germany and Japan after WW2 but those places had wildly different cultures and had recent democratic experiments that had gone decently until upsets happened.
With Afghanistan and Iraq? Nah. Wasn't going to happen. We might, MIGHT have gotten away with making Afghanistan a islamic kingdom under the old King with a conservative constitution, maybe, but when we started trying to emancipate their women and introduce western ideological pushes that chance was gone.
Another example? The smaller civilizations the Aztecs encountered and later subsumed, before they founded their infamous city. We know of some names, and... that's it.
Of course, it's heinous, barbaric, and (in this modern day and age) impossible due to communication methods, records, and the Internet.