I've thought about this before, and I agree with a lot of what other people here have said. I think there possibly WAS the same number of paedophiles etc, but I think that the internet has made them bolder and more likely to act, as they can feed off each other and reassure themselves they are normal (btw, I am in no way neurotic about paedophiles- it is way down on my worry list, but it has crossed mind, that's all!)
When I was little in the 70s and used to go out to play before mum was up, she didn't worry because she knew there were lots of people who would look out for me. If you were upset, an adult would come to see why. If you were lost an adult would bring you home. If you fell over and hurt yourself an adult would patch you up and bring you home. If you were misbehaving, an adult would tell you off. But now adults are terrified to approach kids. My dad adores his grand-daughters but hates the looks he gets when he takes them anywhere, especially if he has to take them to the toilet. I know a lot of older guys who walk their dogs at the park, and they say they wouldn't even intervene if they saw a child fall in a busy road, because of the possible ramifications.
I would love to give my kids more freedom, but who would they find to play with?? Also, if anything did happen, the media would be on you like a flash, decrying you as the worst mother in the world, having you judged and criticised as you dealt with your tragedy. It's not worth the grief, sadly.
Also , I do sometimes wonder wrt modern parenting. Obviously we don't smack now- it is just not done. But I sometimes wonder why kids are growing up with such low self esteem these days, despite being told they are the centre of the universe and never had a finger laid on them. I do sometimes wonder if the way it was when I was a kid- you were warned, you had to push it, you got a smack, you cried at the injustice, but that was it. you got a cuddle and it was done- was more harmful than nowadays when we labour the point to very young children about what they did wrong, how it made the other person feel, how it made mummy sad, how we are disappointed etc etc. I do sometimes think that might be somehow more psychologically damaging, and I wouldn't be surprised if it turned around again, and our kids are telling us "No, mum! We don't talk to our kids about what they've done wrong!! Do you want to damage them? WE gove them a little smack, like this!"
We're all so busy tryiong to make sure our kids get the best possible upbringing they can have. But, yeah, I ate sweets at times, and drank fizzy drinks. But it was offset by the fact that I was outside running about most of the day, and happy. I do think there is something to be said for nostalgia!