To give the conservative perspective: Part of the problem is that the Liberal abuse of asylum provisions has created human trafficking chains of human misery to both America and Europe, with rape/torture/death being the norm in these human movements. Beyond that, the mass migration leads to tremendous political and economic issues in the target countries, disproportionately affecting the poorest. The classic liberal position has been to resist these flows for that reason, while conservatives have been happy to overlook the human exploitation factors in order reap the benefits of cheap labor for the elite.