I thought your comment was really good, but I don't think this conclusion is quite right. The problem is that lots of different people "know" that lots of different things are "right". In my life experience (read: I have no data on this), we don't seem to have the problem that not enough people will "speak up for what they know is right" because they fear trouble, we instead have the problem that not enough people are willing to challenge themselves on what they "know" is "right".

Sorry for all the scare quotes, but my point is that the entire idea that people can know that things are right, and then speak up for those things, is off-base. Certainly, it's a good thing to have a sense for what you think is right, and to be able to speak up for those things, but it's a much better and much harder thing to be open to being convinced that you are incorrect. That's what I don't see much of in our society, and what all schools, and universities in particular, should do a better of imparting to their students! Instead of teaching people to better manage their anxiety about speaking against perceived social norms, we would be better off improving peoples' skills of hearing things they disagree with, and of structuring their own arguments such that they don't drown out that disagreement (for instance, the all too familiar tactic of yelling and/or ranting continuously).