Why do black people treat their own kind poorly?

Most blacks don't support their own kind businesses and give their money to non-whites. From an academic/school perspective, black people that do well tend to want to integrate themselves into non-black social circles and not help out there fellow blacks; aka wanting to be the special negro. When we look at crimes black murders are overwhelmingly committed by other black people.
Other races have some form of comradery and working together. Why are black people the only race that have in fighting and treating their kind so poorly?
Why do black people treat their own kind poorly?
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