They're not invading. They are invited in by Western governments with the support of the majority of the population. I'm not seeing too much in the way of complaint or seeing mass-protests by the native populations. Yes, the migrants are out-breeding the native populations, so that the latter will be a minority in two generations or so, but it's a democracy and the majority seem to support this change. Let them have it, I say. Why try to help people who don't want to be helped?