I'm not going to google the quote right now but the heart of it is that when they care about an issue, their celebrity can bring more attention than the righteousness of the cause.
We have an abstract understanding of the fact that, in different parts of the world, people are facing hardship but a celebrity can get television cameras to show us what is happening.
Why?
I can understand disliking some of the particular causes, or disliking the disproportionate attention given to celebrities, but why would you hate the fact that people who happen to be famous also advocate for causes they care about?
Because most of the time it's celebrity endoresment - appeal to authority, without having authority. Why should I trust George Clooney's opinion on coffee let alone what he thinks about Darfur?
I imagine Clooney's also had more access to finer coffee than myself, but I can safely assume that adverts aren't expressing personal opinions in the slightest. :)
Not sure about that. Great coffee isn't that expensive.
Speaking of celebrity endoresment and coffee - Al Pacino did an ad for Vittoria (Australian coffee brand) which is IMHO burned-tasting, low quality coffee. There was an interview with the marketing people who made the commercial, and the reason why they chose him was purely because he was a well known Italian... making him a perceived authority on good coffee. Spoiler alert - he isn't.
I saw an interview where he mentioned this (probably Inside the Actor's Studio). Words to the effect of: "realistically the studios are not going to fund a biopic about Edward R. Murrow. So if I can fund it by doing coffee ads, that's something I can live with".