This 1965 song is considered significant in the Lennon/McCartney canon, for representing a shift in song subjects from love to politics and philosophy. It was wholly a Lennon composition, looking at one’s place in the world.
In political science we typically consider ourselves in relation to society (the other people we live with and around), and the government (the decision-making institution). Debate concerns the proper size and scope for each of these three elements: should there be a pronounced role for the individual, should government be large, should society help us take care of collective business? You can appreciate that expanding the scope for one part can reduce the responsibilities of the others.
This nowhere man has no opinions and views, perhaps making society and government important?