Causality of a school's influence on the beliefs of its students is difficult to prove?

The political leanings of America's professors are not difficult to discern.   Their party affiliation is public record:

http://www.washingtontimes.com/news/2016/oct/6/liberal-professors-outnumber-conservatives-12-1/

Anyway MSW....why voice your contempt for the few conservative Catholic colleges?   How is that helpful?