Superman was concieved as a vigilante akin to zorro.He was also an alien in hiding as well.If he isn't a vigilante running from the state.If his alien background doesn't frighten people.What is the need for the secret identity in the first place?wanting a private life as celebrity hero is one thing.Would anyone jump through this much hoops for that purpose other than hannah montana.The secret id was a way to cope with that and to make people ease into superman figure.