There's no such thing as a good Empire. Ours was no different. It may seem like a point of pride to say our little island once conquered three quarters of the known world, but it's nothing to be proud of when we did so by stealing anything that wasn't nailed down and killed everyone that got in our way. Even so, we can't ignore that Empires were necessary for the proliferation of technology and knowledge - every single Empire contributed to the development of humanity as a species and we wouldn't have the kind of knowledge and technology we have now if it weren't for the "strong" teaching the "weak" (as it were) - but that does not mean we can ignore the atrocities that those same Empires performed. For example we can't understate how revolutionary something as simple as roads were, which of course we have the Roman Empire to thank for, but we similarly cannot understate how many people were killed or how many lives were ruined by the Roman Empire to build those roads. So as with everything to do with humans, you have to take the good with the bad. You have to acknowledge our successes as much as our mistakes so we know what we did wrong, what we did right, what we can improve upon and what we can ensure never happens again.