Initially, that was my thought, too.
But, then, I got to thinking. Is the tragic post-colonial history of peoples in Africa and the Middle East simply a function of the way their borders were drawn?
With hindsight, how would one draw them today so that the tribal strife and tyrannical impulse would have been dampened?
I've since concluded that colonialism has precious little to do with the problem.
But some of the difficulties of the present time are directly traceable to the breakup of the British Empire, e.g., as Steyn notes, Churchill's lack of foresight in laying out the specifics of the Balfour Agreement. And there are other examples, most notably, in my view, the herding of the Muslims of the sub-continent into Pakistan and Bangladesh.
The Brits, and others hanging out in the corridors of Versailles, played God. But they lacked His infallibility, I fear. We are still paying the cost of their miscalulations.