I don't think it's a bad thing for journalism and academia to be bastions of liberalism; classical liberalism is a wonderful thing responsible for much of society's advancement. I think it's a very bad thing for journalism and academia to be bastions of progressivism because the progressive movement is in large part dedicated to pulling back those advances. It was liberalism that says man has an innate, G-d-given or natural right to be free; the progressive movement not only denies any innate, G-d-given or natural rights whatsoever, but is dedicated to removing as much freedom and individual liberty as possible. It is progressives, not liberals, who believe it's perfectly all right for government to seize someone's property and give it to a rich person as long as government stands to benefit. It is progressives, not liberals, who believe an individual should not have even the freedom to decide what size Coke to order.
As far as why I think that is, three reasons. First, progressives by preference hire only progressives - perhaps a logical step once you've decided that everyone who disagrees with you is insane. The more progressive is a business or an industry, the more progressive it will grow, for this reason. Second, progressives are self-identified with progressively making societal changes that revolution failed to accomplish, and journalism is an excellent place to wield that kind of power. (Or at least it was back when people trusted the media.) And third, progressives dislike individual responsibility, and academia is an excellent place to avoid individual responsibility.