To your first point, many Black people kill Black people. The same can be said of any group of people in a lower economic class. White crimes against white people were quite profound during the early twentieth century during prohibition, but that did not stop them from mobilizing to improve their economic and political standards. We are very good at killing each other, but we are also quite good at building each other up. The proof is the culture we have developed, the art that we have created, and the institutions we have built to improve and enrich ourselves. There will always be rogues of any people. It is our responsibility to deal with them or to exercise them from the community; this is what all peoples do.BTW : Africa has an entire continent of black nations.....
To your second point. Africa does have an entire continent of nations, over fifty of them. Although African states have been largely unstable, they have improved over the last half-century, with nations like Nigeria, Kenya, and Ghana achieving relatively fair and free elections. Africa has stabilized to the point of becoming the preeminent Continent in the world. However, we cannot rely upon Africa to give land to a group of African descendants that have not been a part of continental affairs for over four centuries. African is heavily sectarian ethnically, which has been the unfortunate origin of the instability in the area. Adding hundreds of thousands and possibly millions of Black Americans will do nothing but add another political chess piece on the African chessboard, competing for political resources, such as land, that are already scarce for indigenous Africans. I reference Liberia once more, whom the Black American freed slaves enslaved the natives and exploited the region of its natural reserves of rubber to sell to white countries. This is what happens when two very different people come into competition over scarce resources, and it will happen again. We cannot rely on America to grant us liberation, but we cannot rely upon Africa either. We must rely on ourselves.