Given the pretty heavy strain placed on you academically, it's in the school's best interest to reduce stress anywhere else in your life that they can.
Admissions takes great pains to make sure the school itself is diverse (50/50 guy-girl ratio at a tech school, for example), and so your interactions with other students are guaranteed to force you to work through any diversity-related issues you may have coming in.
Even sharing an apartment with people you don't get on with can be a problem in terms of generating conflict. Roommate stress (especially for introverted conflict-avoidant people like me) is only a negative thing in the context of being a serious student. It's an essential thing to avoid.
Your experience of the world appears to be very limited. If I had to guess, I'd guess you'd never lived anywhere poor.
I have a problem with your argument though, how does encouraging segregation reduce domestic strife? You're assuming that simply being with another group would immediately cause hostilities. Even if it does remove strife, college is only 4 years! It hardly seems worth it to avoid some discomfort you will likely face more and more in the future.