That's the same answer the LePen voters are coming up with, but it won't solve the problem. Take Sweden: there are only about 8 million Swedes. At their current birth rate (and it is still declining), in six generations -- call it 120 years -- there will not be enough Swedes in Sweden to occupy a decent-sized town. What are they going to do, put up a fence?
All these people are either going to change their priorities, or they will be overrun by people from other cultures. That can't be stopped; it's Nature At Work.
Their countries are close enough to India and China that they get the part about overtaking the world real well. China will probably overrun Russia. The Indians will be coming their way. They probably see what they are doing as defense.