The West needs to rethink their policies on immigration. ...
Europe is overcrowded ...
... there are problems with overcrowding and a lack of resources.
You keep saying this. It keeps not being true, despite your repetition of it.
The EU can easily handle a far larger population than it currently has. There are local areas of both high AND low population density that have problems due to poverty and lack of education of the local residents; And there are other areas of very high population density that have great wealth and prosperity - thereby clearly indicating that 'overcrowding' is NOT the issue. Nor is immigration.
Take just one example - the London Docklands. Sixty years ago it was crowded and awful, but contained almost no immigrants. Today it is crowded and prosperous, and contains very large numbers of immigrants. Crowding isn't a problem; Immigration isn't a problem. Poverty is a problem, and immigration helps to make the nation richer, so it is one possible solution.