So, this thread has returned to the old "Is it Clark or Superman that's the disguise?" debate.
I hate this debate. I really really do. Largely because it doesn't make much sense to me, and runs counter to everything I've ever learned about literature, something I've spend the last five or six years of my life studying quite a bit.
Superman is Clark Kent. Clark Kent is Superman. They're the same guy. And as the name Superman is a more recent addition to his life and he grew up with the name Clark Kent, then in terms of knowing what to call him you can say that he's Clark Kent. When he's at work, in the suit and the glasses, does he hide things from the people around him to keep up his lifestyle? Yes. Are any of the opinions, desires, or interests he expresses, or any of the relationships he forges, thus a lie? Of course not. When he's in the costume, saving people and working with the Justice League, is he hiding things from the people around him to keep up his lifestyle? Yes. Are any of the opinions, desires, or interests he expresses, or any of the relationships he forges, thus a lie? Of course not. In either case, does he affect his posture, voice, and the way he approaches and deals with people for the sake of practicality? Yes. Does that mean that he's not being true to himself in either case? Not really, it just means that he's being pragmatic, or doing what he's comfortable doing under certain circumstances. I'm sure when he's with the Justice League, he revels in the chance to be authoritative and take charge, and when he's at work, he revels in the chance to take a break from being authoritative and taking charge.
They're both him. He's not two people, or three. He's one guy who wants to do certain things with his life and wants to be a certain way and express certain things when doing those things, and those things only function when he keeps them separate. In essence, he's pretty much the same as most people, he just has much bigger responsibilities. The idea that he's two people, that there's a real Superman and a fake Clark or vice versa... it's poetic, and it's a nice shorthand for describing the character, but it's simplistic and it's not how people work. Especially not how well written fictional people should work.
I feel the same way about Batman's whole "Bruce Wayne is the mask/Bruce Wayne died the same night as his parents" thing. It's a poetic way of describing him, but that's all it is. Poetic. A full description of his character would be infinitely more complex and nuanced.
I always kind of liked the idea that Krypton's downfall was caused by a combination of pride and xenophobia. They saw themselves as the greatest civilization ever, and thus could not imagine that they could ever fall even to natural disaster, and due to whatever bad experiences they'd had with interplanetary contact in the past, the idea of going out into space was a cultural taboo even though they had the technology.