Donald Draper wrote:
Well don't forget for much of Batman's early publishing history he was read by a younger audience than today. He fought outlandish crimimials who robbed banks and did not kill people. That was there in the beginning but went away around the time Robin first appeared.
And it's not like Nancy Drew and the Hardy Boys weren't running around catching smugglers and counterfeiters and bank robbers on their own. Children's fiction (which is what comics were back then) was full of kids getting into dangerous adventures. Think Jim Hawkins in Treasure Island,
Huckleberry Finn, even Tom Swift . . . .
(And, later, there was also the Three Investigators, the Newsboy Legion, Johnny Quest, and so on. Children's fiction tends not to be about kids who stay home, obey curfews, and never get themselves into risky situations!)
It was a simpler time.