Wanky question or exposing a logical fallacy - you decide!

Having looked at my flist this morning, one question arises.

Why is the statement "I am so happy for Pete and Ashlee! I hope those crazy kids with their adorkable faces will make it!" seen as an acceptable level of investment in random strangers who are also celebrities, but "I am disturbed by this marriage and I don't think they can make it" is perceived as an unacceptable level of investment? I don't really fall into either category, but I find myself rather curious about the way these responses are valorised in fandom. Any thoughts?