The movie's most vivid, appealing character, Tommy is struggling with a big question about life's big questions. He wants to know, "Why do people only ask the big questions when something bad happens and then forget about it?" He also considers America's oil consumption beyond disgraceful and has taken to riding a bicycle everywhere, even to fires. In one of the movie's sweeter scenes, he beats the fire truck to a fire and does a little dance of triumph in front of the burning house.
That's about right.