"There must have been extremely high levels of unemployment where you lived." - not at all, all my classmates had working parents, like me. I don't know how those parents were managing their time, but they had time for their own kids. I saw it every day.
My parents never had time for me because "They were busy, working hard!". Even in this thread, most parents say they find time for their own child, and won't let a 7 year old walk on their own. I'm sure they work too, not everyone is "unemployed"!
"If it isn’t normal, or what most parents do, then why do virtually all parents do it in an entire country?" - you can't talk about what whole country does, because you don’t know personally what every person from the whole country do! You know only what your friends and family do, that doesn't mean it's right, you should do the same! Even if you are right, and the whole country is doing the same, it doesn't mean it's the right thing to do.
For example, in our time, in Somalia, parents still cut girls clitors because that's what is the right thing to do in their own heads and it's "their culture"! We all know that is a terrible thing to do to any child! They do it to small girls between the age of 3 and 12! Only because there's a whole country, in our time who do it to their kids, it doesn't mean it's the right thing to do!
"You also clearly have a very limited understanding of what neglect actually is" -
I lived through child neglect and I know very well what it is and how it feels! As a child you think your parents are the best parents in the world and you love them dearly and listen to them and want to please them. As an adult, it hits hard when you realise what happened to you in childhood was actually child neglect.
Do you even know what child neglect is? Did you live through it? Or you think child neglect is only what parents in Somalia do with their small girls, everything else is not neglect? Because everything else, if you'll compare with parents from Somalia is only "mildly" neglect, without physical abuse involved?