This simply isn't true. Anybody who is interested in politics could use a few insights into a variety of ways to be an active participant. In fact, I suspect a majority of people in this country have several issues they care a lot about and that are not being addressed by formal channels. That doesn't mean they are all on our side.
I would argue that non-organizer types would get more out of listening to Graber than organizers precisely because they have fewer preconceptions that need to be addressed. Just show up and see.
Where are the places in this society where you are not told what to think, how to act, and what to do? Near zero.
CG