Re: Bronze Age Champions
It's hard to say when the silver age ended/bronze age began, because unlike the end of the golden age there wasn't a hard and fast line. (The golden age ended with the senate hearing on "Seduction of the Innocent", especially William Gaines testimony.)
In the golden age, superheroes were vigilantes operating outside the law. Villians often died due to the heroes actions (not directly, but indirectly. Two-Face died because Batman chased him to the top of a drive in movie screen, and Two-Face slipped off, catching his neck on a telephone wire.) Law enforcement was seen as ineffective, or even corrupt.
In the silver age, superheroes worked alongside the law. The police commissioner had a private phone line to Batman! Law enforcement and government in general were effective, only needing assistance for unusual or superhuman criminals.
The bronze age, superheroes became more independent, thier private lives became more important, police and U.S. government could be wrong or even the villians, the companies started ignoring the CCA... as others pointed out, some of these elements started appearing with Spider-Man in 1962. But it wasn't a hard line. You can't point to one event and say "Here's the border".