I'm skeptical that uniting Africa would be horrible for Europeans. Most of the interaction I've seen in my lifetime has been trying to help them - overseas aid, band aid and all that. We weren't fans of Gaddafi's dictatorship and sponsoring of terrorism but that's another issue.
Can't say I'm an expert on all of it but as David Cameron put it
>I would say it is not only a moral obligation that the better-off countries have to tackle poverty in our world when we still have over a billion people living on less than a dollar a day, but it's also in our interests that we build a more prosperous world.