While Colonialism was horrendous it undeniably had some positive legacies. Madiba himself acknowledged this in a speech he delivered. Don't take my word for it; here is the link: http://www.politicsweb.co.za/documents/legacy-of-british-colonialism-had-positive-aspects.

Helen was undeniably politically incorrect and insensitive but factually correct. Most  serious historians acknowledge this, even some of those of Africanist persuasion albeit reluctantly .

Was the Industrial Revolution all negative? How many millions of people worked in horrendous conditions for pitifully low wages and prematurely died of painfully debilitating diseases? Yet without this period of history, modern manufacturing arguably would not have resulted. Comparing colonialism with the Holocaust is too much of a stretch, Certainly some technological innovations resulted out of that period of history; however,the human- race can do without weapons of mass destruction, Fanta , MDMA etc