I agree that they are not inherently negative. On the other hand, they are not very positive either, sung from a downtrodden or depressed perspective.
School sucks. Life sucks. I'm going crazy. I'm lonely. The establishment is evil. They took my daddy from me. Mom was over-protective. You never talk to me. People are lemmings. People are greedy.
I don't know of any really positive PF songs, but there are some hopefule ones, at least. Division Bell has one (Lost for Words), and so does Momentary Lapse of Reason (Learning to Fly).
