I see it as a (back then) youngster's reaction to the prejudices of the big city people who were at the cutting edge in fashion, culture, music (almost to the point where even rotten punks, in London, were looking better than them) towards four miserably looking boys wandering for the purpose of a record deal - "I'm more than you see, more than you let me be"; they were still holding hope they would have broken into that world - "You don't see me, but you will" / "I'm leaving the invisible world" - by means of music as expression of a vivid soul as opposed to the surface that everyone was looking at. I see "I won't be my father's son" as "I won't be Paul anymore, I will be Bono". Eventually, that contrast is broken with "There is no them", which can sound as a plain "Who fuckin' cares" or, in a wiser, adult point of view, as if that contrast is ultimately solved as the music is able to reach the most "different" dude.