I actually said, "it's rather more complex than that rather flip comment", and I didn't mention "various psychological reasons", although I did mention the historical background, which is different, for example, from that of people who have experienced hundreds of years of freedom and democracy rather than hundreds of years of discrimination and oppression. To use your own term, "civilised people" don't impose minority rule, oppression, violence, discrimination, exploitation, etc on the majority of the people, culminating in formal apartheid, and when an uncivilised minority do so, the consequences are unpredictable to say the least. To then accuse the victims of that sort of uncivilised behaviour of themselves being uncivilised seems a trifle unfair.
But we stray off topic. I have made my point, for those who are interested in taking a broader view of this topic.