I found the article extremely unhelpful. It only offers operational definitions of what constitutes a liberal or conservative student. It equate liberalism with protests of any type. And, because it’s hard to imagine what a conservative protest would even look like (is anyone really going to risk mass arrest for a lower marginal tax rate for corporations? Probably not) it basically leaves conservatives in the position of defining themselves as “not liberals”. Thus, all the signaling and processing seems to point to the political divide being less about ideology than about some kind of cultural tribalism that is designed to set the teeth of the other side on edge. Back in the day, a little cultural dissonance was considered a good thing.