To me this song is about a person who is always there for their 'friend'. They wonder if they screw up will this person still look up to them. I would say the friend is obviously a girlfriend because she is his weakness or just that he knows this person is bad for him because he is always having to 'save' them, which means he helps even when he knows he shouldn't "I'll keep you by my side with my superhuman might...Kryptonite" and the dark side of the moon stand for the badness in the world today..or it could be his friends drug addiction
To me this song is about a person who is always there for their 'friend'. They wonder if they screw up will this person still look up to them. I would say the friend is obviously a girlfriend because she is his weakness or just that he knows this person is bad for him because he is always having to 'save' them, which means he helps even when he knows he shouldn't "I'll keep you by my side with my superhuman might...Kryptonite" and the dark side of the moon stand for the badness in the world today..or it could be his friends drug addiction