Man oh Man, would I support that. They should go back to their 'roots'.
I said that in jest, understand the purpose; these people have no intention to give up privileged lives and move to a hell-hole. This sort of goal is promoted in order to encourage African culture, and to see those of their skin color (technically, there are dozens of races of black people in Ethiopia alone, as well many more throughout the continent) as their brother, and not their fellow man. It also encourages the belief that they were taken from Africa, meaning white people are the thieves, and "they be takin' back wuds urs" by killing white people and taking welfare. I could write an essay on this, but trust me when I say, don't support this, because not only is it infeasible, its a trap to make you look racist while encouraging what I mentioned.
I would, however, encourage black violent criminals and deadly drug dealers to be extradited there, where they can really realize the world their actions carve.