This Chaim Amalek must be from NYC. If he'd come to the west coast, he'd see plenty of different colors. Furthermore, he's obviously never been to Israel, where over 60% of the population is olive colored or darker. Anyway, enough of Jews perpetuating these anti-semitic myths. Your average European, whose family lived in the same village for hundreds of years, is more likely inbred than any Jew, whose ancestors have circulated around the world to marry. Check the bone marrow registries, and you'll see that Jews are the hardest to crossmatch. In Israel, almost everyone is "racially intermarried" and as such its very hard to find unrelated donors. So don't look to your English-ancestry neighbors for guidance with regards to avoiding incestuous marriage.
Furthermore, in the early centuries of the first millenium CE, it was common to intermarry and conversion was easy, until the church made it punishable by death, sometimes to a whole community, hence the contemporary strict laws (and why they should be alleviated).