No successful colonial power dismantles the police and other civil structure.
Read history. Even the Germans invading Western Europe left the police intact, as well as water bureaus, power companies, and so on. They were not so utterly stupid as to shut them down because some of the workers may not have approved of Germany.
What did the US do in Japan - fire everyone who worshiped the Emperor? What are all those armed people going to do when the people don't have services, are getting more and more bitter? Hint - Iraq.
Unfortunately the Bush-Cheney people didn't read history, didn't plan, and, frankly didn't think.