Whilst I'll agree that the British Empire shouldn't have divided up the land as it did, I think simply saying 'It's Britains fault our invasion went to ****e' is just a little far of the mark 
Sure, I know this has happened more than once in history, but, as you said, the British did most recently.

I'm in no way saying that its the Empire's fault that the war has been mismanaged; that's not even related.
EDIT: Damn you and your posting first Mefustae.

one could say the same for: "it's all the US's fault"
were are responsible for removeing a repressive force that forced these people not to kill each other, we are not the reason they want to kill each other.
That makes about as much sense as my going into your house, banging the **** out of the tap in your kitchen sink until it breaks and starts spraying water everywhere, and then claiming that it was in fact your own damn fault for having that water in there to begin with.
No, but it's like saying that that faucet was going to fling off at one point and get everything really ****ing soaked, but I just happened to come in and knock it off earlier. Very few people have managed to keep a typically-disunited people together without ethnic violence; Joseph Tito is a great example. He held Yugoslavia together during the Cold War, but after his death, the region erupted in ethnic cleansing. Same goes for Rwanda (at least I think it was Rwanda), where its leader had died in office, thus allowing the deeply-rooted racism to explode into genocide.