Because they take advantage of African's good nature and naivety and only allow corrupt politicians to lead, for the benefit of colonialism.

British also did the same here, they exile good leaders in Malaya and install corruptible rulers. It is simply good for business if you have leaders that align with your goals.

They were never interested in sharing their knowledge with those they steal their land from, they have the same zionist mentality, heck, they also mostly came from Europe.

That's why Nelson Mandela said:
“We know too well that our freedom is incomplete without the freedom of the Palestinians.”