I think Aaron would have advocated--as the movie aptly points out--a re-thinking of one's approach to life in a way that involves more political activism than we're typically used to, versus a one-time reaction. There's a wide range of political issues for people to make their voices heard on.
Directly related to Aaron's interests, I'm suing the Courts over PACER and other related issues. See http://www.plainsite.org/dockets/29himg3wm/california-northe... , where document 23, the First Amended Complaint, is the main one to read. If anyone wants to file an amicus brief/write a letter to the judge in the case and/or the Administrative Office of the Courts, this would be a good time to do it.