You're right, it's hard not to be swept up in the culture of doom.
However, I think we're facing hypercritical challenges that require the US (I agreed w/Obama when he spoke about humanity's last, best hope) to stand up and take responsibility for ourselves and the future of humanity, but, instead, we're about to make a hard turn towards the libertarian right and a complete lack of cohesive, common-good-oriented governance. That makes me pessimistic, because the planet's ecological coherence (biodiversity, circulatory and immune systems) has been almost completely corrupted/destroyed, and our civilization's existence, already unsustainable 30 years ago, has become fundamentally suicidal.
I feel like my moderation is an echo of what we should have been doing for the past 30 years. Now, all the ideas I am hearing for new philosophies (especially the Randian objectivist/libertarians) are radical and dangerous, and it's becoming unclear upon what middle ground my moderation should operate.