I don't think anyone can justify British colonialism in the strict sense. And while British rule over HK was relatively benign (compared to other colonies), it still had its dark and ugly side. But I suppose one thing the British did get right was endowing HKers with notions of civil liberties. Looking back, its ironic how the British never granted HK democracy, but did leave a legacy where at least some of HK citizens hold democratic ideals as the virtues to aim for.