The need for dehumanization of peoples based on their physical characteristics is brought about by capitalistic competition. Racism is a child of capitalism.
Capitalism is based on the drive for personal gain at the expense of the many. Profit is the net gain from labour and physical resources. To make a profit, one must acquire resources cheaply and underpay labour.
The real cost of labour and the cost of resources equals the price of the product. To make a profit, a commercial enterprise must underpay labour and acquire the resources needed at as low a cost as possible.
Colonialism and slavery are the bedrock of Western Civilization. As Jean-Paul Satre says in the Preface to Franz Fanon's seminal work, The Wretched of The Earth, says that, to be a Man, the White Man had to make beasts of the rest of Mankind.
Racism rests on the idea that some races are more human than others. This then justifies the subjugation, enslavement and total dehumanization of those peoples regarded as less human
The forceful and violent acquisition of lands, minerals and labour of those that do not belong to the Capitalist society then follows as a matter of course.
It is important to note that prior to Western Industrialization, slavery was a social-class factor, not of race. All races were subject to slavery and at a moment in history, slaves as a social class were conquerors and established ruling dynasties(the Mamelukes).
Enter the Industrial Revolution, capitalism and it became expedient to target entire populations and alienate them from humanity just because capitalism required cheap labor. Whole peoples,could now be dehumanized by Bible-wielding gate-keepers with the dollar on their minds
It must be understood that MauMau was a movement of an entire people with a fighting unit in the forest.
But many confuse the fighting unit as the entire MauMau.
Oathing was a way of excluding those among the people that did not identify with the cause.
MauMau Oath-taking has been twisted by colonial and the collaborator spin-masters as a savage and barbaric ritual.
But any body that involves an element of secrecy and a measure of loyalty have oath-taking as a core ritual of membership in such an organization.
During pass-out parades, soldiers take an oath.
Priests and nuns take an extensive oath of loyalty and vows of maintaining the secrecy of the mysteries they learn for two years cloistered away.
An oath says you commit yourself to the cause.
A refusal to take it says you do not