I don't give a shit about politics or celebrities.. I only watch adult swim every once in a while..
But I don't think it's dumb for people to keep tabs on celebrities just like I don't think it's dumb for people to have a favorite sports player.
Some people like to keep tabs on intelligent people because they like what they have to say. So what's wrong with following a "star" if the fan likes them?
Example: I like nirvana because kurt cobain has some pretty cool views on some subjects. I decided to look further into his music to hear more of his philosophy. Turns out the dude blasted his brains out.. What's wrong with knowing that? I mean I don't really care for the dude since I've never met him, but I do find his views interesting.