as an education professor, my goal isn't to teach the students who all score the highest on the SAT. perhaps Roger and "Common Sense" posters want that, but i find that having a diverse class helps me teach my curriculum far more effectively. we are required by our accrediting body to prepare teachers to teach in a heterogeneous world and having a homogeneous student body runs counter to our goals. i can try and prepare my students to teach in an inner city school but it's far more effective if a student actually attended this school who can share her experiences and give that extra rationale for the classroom management or learning strategies i am teaching. the same can be said for having students who attended a private Christian school or a school in a rural setting, etc. -- the diverse student body helps the curriculum i teach and that value is lost if a university goes on test scores alone.
The educationists are living in a completely different universe from the rest of us.