@Terrificli -- Good points but the people should be worried about online security even if they are using their own computers in their own rooms on campus networks. Colleges offer public computers in labs, but the activity on them is often no more viewable than that of private computers logged onto the network.
And I would argue that anyone who logs onto one of those college networks has a greater chance of being observed online. In your example, 20,000 people is a big number but not nearly as large as the number of people who go through ISPs at home (some of those networks have millions of customers). If a hacker targets someone on a college network, then sheer numbers suggest you are more vulnerable than non-students on networks with millions of subscribers.
And computer security has a lot to do with hackers. I don't care if system administrators look at what I do online or not. From a safety standpoint, I'm more concerned about hackers getting my information. You have to be extra careful of them when on comparatively small, college networks.