There's also a lot of discussion here around the people who get excluded because they lack that pedigree. I don't think anyone is saying that you can't find brilliant folks who went to a small school you've never heard of. They're saying that you're hiring for one professorship, there are a lot of unknowns, and you're trying to eliminate false positives to avoid a bad hire. Seeing that between two otherwise-identical candidates, one of whom has a BA from Harvard and one of whom has a BA from West Virginia State, you're well within your duty as a member of the hiring committee to assume that the person from Harvard has at least as good a chance of being acceptable as the other one. False negatives are okay (not great), false positives are horrible.