Rosenbaum cites recent studies (regrettably, without links) that show that "emotional harm is equal in intensity to that experienced by the body, and is even more long-lasting and traumatic." Thus, the victims of hate speech, he argues, suffer as much as or more than victims of hate crime. "Why should speech be exempt from public welfare concerns when its social costs can be even more injurious [than that of physical injury]?"
No surprise that a socialist professor wants more regulation on speech. Of course the real reason is to supress speech from conservatives, libertarians, and others he disagrees with.
I love learning about new and hopefully more productive programming languages, but I also have found out that with the limited amount of time that I have, that I need to focus on things that are relevant to my career.
I used to justify playing around with Clojure and Scala because it would give me insight into better ways of problem solving when programming. But one day, when I was sitting at work, I realized that I need to concentrate on things that were relevant to my job that I was weak on - Javascript, SQL, etc..
So I think it's important to know what's relevant to you and your goals instead of endlessly toying with the latest shiny thing.