I have had this converstation with my dad.
He was born in the 50s and used to be out all day. No one watching. He lived in a village and no one minded someone else telling their kids off or helping their kids if they were hurt. It was more of a small involved community.
I was born in the 80s in a city. We weren't allowed to be gone all day etc and I asked him why. He answer was simple. That while he upbringing seemed great and he turned out OK, several of his friends didn't survive childhood, due to accidents that happened because they were unsupervised. Or worse, they may have survived if an adult had been there quicker.
He felt that as news became less localised and everyone heard what happened everywhere else, it was going to make parents more wary. Dad doesn't think anything is more dangerous, he just thinks people's perceptions have changed.
Aside from the amount of traffic on roads, dad thinks that the world was just as dangerous. People just didn't perceive it as such. Like his head teacher liked to run his hand up and down young girls legs while they read their books aloud to him. Dad said no one would dare tell their parents, because you would get the cane for lying.
Or it was known one man in the village was abusing his children (beating them all the time) and no one did anything because you didn't 'interfere'.
Dad said he is in no doubt his parents loved him, they just lived in a different time with different views. He doesn't think it was better though.