Somebody is hellbent on turning western Europe into third world shithole and those migrants sure as hell have neither capital, nor organization or common ideological ground to pull it off.
Not only Western Europe, the North America, Oceania (Australia and New Zealand), as well as countries in the Eastern Europe (Macedonia, Montenegro.etc) are witnessing unprecedented changes in their demographic makeup. A few countries in the East are still resisting the trend, such as Poland and Lithuania. But soon these countries will also change, as they are forced to accept hundreds of thousands of Sub-Saharans.
One way for leaders to achieve increased control over their citizens would be to introduce a problem then provide a solution. If a majority of 'natives' of a country feel threatened by newcomers and have no realistic alternatives for 'protection' than the state, that's what they will choose. This could take the form of increased surveillance of society generally and an increase in the number and capabilities of state sponsored paramilitary assets.
I wonder if this is not one of the main driving forces behind the push to control guns in private hands here in the U.S. The more people feel confident that they can protect themselves, the less inclined they are to rely on the state for various kinds of protection.
As best I can tell from afar (sitting here on the West coast of the U.S.) it seems that Western Europe is a lot farther along the path to centralization and that planning and directing these population movements is handled mostly from Brussels. It's an interesting thing to watch. I'll be paying closer attention to the phenomenon.