Good question. I used to think the universe was more important. About five years ago I changed my mind, left physics behind, and began studying psychology.
Human thought and behavior is still too primitive to cope with and wield the fruits of the technological revolution we're living through. Racism, hatred, war, superstition, egomania, addiction... there are too many weak minds; too many slaves to our instincts.
I wrote a hub about Harry Truman: a petulant, childish man, and I thought to myself "how could this man have been put in a position to drop Atomic bombs on civilian populations, decide the fate of Israel, and determine American foreign policy for the next 50 years." What disaster lays in our future if we continue to put the universe's power in the hands of weak minds?
Another point is: how do we cope with this ever-changing world if our minds have evolved to deal with a more traditional style of living? Anxiety and depression are on the rise, and it's probably down to the increased uncertainty that urban living introduces. Our brains simply haven't kept up. To compensate, we must understand our limitations and attempt to conquer our biological biases and propensities.
All these problems could be dealt with better if we understood our psychological make-up better. Perhaps psychology could be taught as early as primary school. It would help people deal with life and become well-adjusted people. Imagine a world where, instead of getting angry and fighting, people sought to understand what was making them angry, and defused the situation rather than giving into their primitive urges.
Finally, I'd like to say that seeking to understand the universe before understanding ourselves is like trying to run before you can walk. If we understood our own minds and motivations, and spent less time giving in to our primitive instincts, we'd be on a much better footing to enrich our scientific understanding of the universe.