It wasnt the flaming dark ages you know!
Me and my friends did this and so did all the kids in the surrounding villages/town. Never once heard of a child being killed or dying due to being out playing and trust me word travels fast in small rural areas. Do not generalise because of your opinion.
Kids here still do this, its normal childhood round here. Its much better than being stuck inside all day on a computer. (Mine do play computer games with their mates online too but not all day every day.)
I think its much more dangerous in big cities/towns for kids these days due to the lack of plces where they can go and just hang out together in safety. Gangs are a huge problem in cities and knife crime is prevelant which we wouldnt have believed a couple of years ago. There were no such thing as gangs and territory when I was growing up apart from in american films!
When I was a pre teen/teen there were youth clubs, sports clubs, small cafes where we could hang out and not be seen as a threat. We sat on street corners in summer just chatting and doing nobody any harm. We knew just about everyone in the village and they would say HI or stopped to chat on the way past. These days a few kids hanging around together is seen as a bad thing whether they are innocently talking, just out walking or not. It seems that any kids outside with friends must be up to no good! Thats a sad change of affairs. (and having seen some of the threads on here for the last few years some are guilty of judging any person under the age of 25 being out on their own or with friends without 'adult' supervision a threat to themselves and the whole world!)
I wouldnt change my childhood for anything, freedom to roam, fresh air and exercise, spending time with friends. My kids have had the same and I am glad they still do.