Comicdom has forgotten that when baby Kal-El was originally enroute to Earth he took a detour through a space warp to another universe, where the only power he had was Super-Poor Fashion Sense.
In this world Kal-El (named Sonn by his adoptive parents) radiated an energy that made people smart. From the effects of the radiation the tribes evolved from a cavemen-level existence to a futuristic Krypton-like society in about 8 years. In fact they got so smart that they decided to hunt Sonn down and kill him, thanks to the machinations of his jealous sister, who was earlier zapped by a monster, who turned people evil by looking at them.
She was always bad news, but getting spot-lighted by the evil-inducing ray kind of sealed the deal.
The ironic twist was that when the baby was sent back into space it removed the influence of the evolution radiation, so the people regressed quickly. Now instead of being evil and smart they are evil and stupid. I can't decide which is more dangerous. But I doubt these people lived until the Crisis erased them. A futuristic city populated by ape-like humans probably blew itself up the first time one of them noticed a shiny button at the fusion plant and pressed it.