I used to be a lot more into philosophy but these days I'm basically running on the assumption that the only thing that cares about what we do is us. Also, if there's meaning or purpose in the universe we're probably not smart enough to find it.

I also think that we're nowhere near as clever as we like to think we are. Or as Douglas Adams put it: "...on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much—the wheel, New York, wars and so on—whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man—for precisely the same reasons."