"Other parts of the world aren't like this because there are other things which can link people and turn them into a community.
So that's why in the rest of the world, in all fairness, it can be possible that black people kill other black people or are hostile to them, just like among white people too, because they're different tribes/nationalities and those don't like each other."

Yes, yes and yes - divide and rule - wise people are telling about it all the time - the more divided the country, the easier it is to rule it, plus the USA is on the brink of financial collapse, so while the authorities and banks workers are doing their best to lie about things to make more money and flee somewhere - the country is going to pieces... I've just thought about Germany - what were the real reasons of fast growth of Fascism in Germany instead of the wish of USA to become the first country and so on - the real reasons are the poverty, uncertainty, financial instability of Germans at the moment desided that the Jews, crazy, drug addicts are to blame with all their problems while the Germany were paying all free money for the first world war reparations...