[throwawaysocks]

That largely depends on the depth of the engagement.

Reading Das Kapital should be an exercise in critical thinking, regardless of one's political persuasion. For example, where in the software industry is the labor theory of value a reasonable model? Where is it not reasonable? Why? Answering these questions requires what any reasonable person would call critical thinking.

Conversely, hearing a bunch of passionate lectures about worker's rights movements is considerably less enlightening...

[coliveira]

I don't see any problem with passionate lectures about worker's rights movement. In college I also heard passionate lectures about the marvel of free markets, and had to endure them. Different professors have different persuasions and that is all right, they're not trying to fool anyone. It is up to each one to form his or her personal views of the world, and use the information they get from history and philosophy to enlarge these views.