It's even worse than that. The Slashdot movement operates much like a cult. It takes teenage geeks who are in a situation where they feel isolated, helpless, and angry, and they give these people a strong support community that will not only alleviate their feelings of isolation and helplessness, but give them a corporate monopolist to lash out at.
I thought that looked familiar
:). More seriously, though, it's a general problem on the internet: little communities end up being these self-reinforcing echo-chambers with no outside influence to challenge people. I'm not sure it's going to improve any time soon, either.