People naturally take care of their own; that's taken for granted. According to the Talmud "love your neighbor" means "love Jews".I don't agree with JP very often, but here I shall agree with his statement, if not his implied intent. Yes, it seems people do have a natural inclination to favor those who are similar to them over those who are different. There was a cover story in Newsweek about that a couple of weeks ago, which mentioned the following experiment:
So it would appear that JP is correct that there is a natural tendency to develop "in-group preferences." But we have two choices: we can either try to overcome this tendency, or we can succumb to it. Modern liberal morality demands that we should attempt to overcome this in-group preference and make a concerted effort to treat all people equally, while JP's Torah morality dictates that we succumb to this tendency and treat people in our group (Jews) different than those outside it. So which is more moral? Should we surrender to this natural tendency or try to overcome it? Personally, I think this is one tendency I would like us to fight against. It seems that once we succumb to this nature that it's a short step to outright racial discrimination.
It takes remarkably little for children to develop in-group preferences. Vittrup's mentor at the University of Texas, Rebecca Bigler, ran an experiment in three preschool classrooms, where 4- and 5-year-olds were lined up and given T shirts. Half the kids were randomly given blue T shirts, half red. The children wore the shirts for three weeks. During that time, the teachers never mentioned their colors and never grouped the kids by shirt color.
The kids didn't segregate in their behavior. They played with each other freely at recess. But when asked which color team was better to belong to, or which team might win a race, they chose their own color. They believed they were smarter than the other color. "The Reds never showed hatred for Blues," Bigler observed. "It was more like, 'Blues are fine, but not as good as us.' " When Reds were asked how many Reds were nice, they'd answer, "All of us." Asked how many Blues were nice, they'd answer, "Some." Some of the Blues were mean, and some were dumb—but not the Reds.
(Although he didn't say so clearly in the comment, it would seem that JP is endorsing the Talmud's view that we should embrace our natural inclination towards in-group preferences. I don't think I'm being unfair in assuming this, considering the views about the origins of morality that JP has espoused in the past.)
Incidentally, I find it sort of telling that in chassidus shiur we were always hit over the head with the idea that we should fight against our natural tendencies, especially the "animalistic" sexual taivos, but fighting the natural tendency towards in-group preferences was never mentioned. In fact such preferences were encouraged ("You are the best of the best, hand chosen by the Rebbe RaShaB to be in his heiliker Yeshivas Tomchei Temimim.") As is often the case with religion: masturbation is tantamount to murder, but bigotry is just fine.