I think it is hard, because standards were different back then, and we can't judge by today's standards.
My mother didn't work when I was 8, but amongst those friends who did, they were latchkey kids, that was the norm. I don't think it was neglect or abuse back then, because childminders and after school clubs were unheard of, I don't remember any of my friends using them. They just went home and let themselves in. And we played. If you worked, you asked a neighbour to keep an eye, and that was that. I remember my own mother doing it. When she got a day job (when I was about 10), she worked and I stayed at home (in the holidays alone). My nan was close by if there was any problems, but no one kept an eye on me, and I didn't want that - that was babyish, as I was used to having so much more freedom. It wasn't neglect, it was the standards back then. Just like parents used to go out of an evening, and leave us asleep in our beds. Now that's unheard of, back then - the norm.
My dad used to walk himself to school (over a mile) alone from the age of 5/6. I did it from 7/8. At my DDs school, they would frown on it now. Standards and rules change. When I thin back to the freedom I had compared to my own children, it is totally different. I would roam all day, coming back for my tea. I went miles, DD is only allowed to stay in our estate. Our mothers never knew where we were or what we were up to, again that was the norm. Today, that wouldn't be acceptable. Standards change, but I don't think we can necessarily look back to the 1970s with 2010 standards. And I have to say, whilst I wouldn't go quite as far as the freedom I had in the 1970s (playing out in the street at 3!), sometimes I think the 2010s has gone too far the other way, but that's another thread.