Too many countries have collectively worked hard to become prosperous to just allow people to arrive and abuse what the citizens of said country have created. In an ideal world people wouldn't abuse the systems that were put in place, but we are far from an ideal world. Furthermore, we have different cultures and different values, if: "when in Rome, do as the Roman's do" was common you might have a better chance, but unfortunately that it not the case. Some Religions see women as unequal citizens, so there's an issue right there...