It's the same reason university campuses (yes, I know...it's campii in Latin lol) are generally more liberal than the population at large. It's because different ideas, theories, hypotheses are being bandied about by people who've done quite a bit of research in their fields, often times having studied abroad, or even having been born overseas. That's what gives college campuses their intellectually stimulating atmosphere. The mind is presented with alternate ideas, theories, traditions. Of course you don't have to embrace all or some or even any of them, but it gives you a wider, clearer world view when you consider them.