Scifi was being done by other heroes at the time..aliens and all that jazz.I understand why not focus on it.But,jor l did exist before superman in publishing history.So,there is that.
Though that might be true.Bringing scifi(more like fantasy) to superman might have been mort weisinger's goal.Moore,thinks "dopey" things like krypton came from his experiences.I do kinda agree that superman would be this irritating jerk or an asshole many a times."Very unlikable" individual whom would be bordering on authoritarianism..But,evil? i don't think so.
For me,these stories hit home runs is cause there is genuine emotions being portrayed.And It can't exist in a vaccum.If you don't feel these things somewhere deep inside you can't write these things