It's just one more opinion in a sea of opinions...
I like Tim Robbins, think he's an awesome actor and probably a pretty smart guy too. Definitely a Humanitarian with a capital H. On this particular matter I'd have to disagree with him.
It's interesting how many "space movies" he's been in, if he harbors a philisophical disagreement with humanity's push into the cosmos. Maybe he thinks if we get our fill of it on the silver screen, we won't feel the need to actually go there anymore.