As adults they will be scared to do anything. I have a friend who was very overprotected as a child, she is scared to take her daughter to the woods in case they get attacked! She is also too scared to go to London (she lives in Surrey). She thinks every other bloke is a child aductor waiting to take her daughter! There are going to be so many more adults like this in 20 years time. They will also not be able to cope in tricky situations and are more likely to get into danger.
The media are to mostly to blame i think. The news, if you watch/read it all the time gives you a distorted view of our country and it scares people and it stops people trusting others. Its much better to make friends with your neighbours/community, to go out, to travel and meet people to find out what happens in the world.
When you have communities that all know each other the children are safer, they can play out and others look out for them.