Like, people who were born at around the 40's and the 50's, those are the parents we're pissed at
Which is the same as my parents, and all parents before them. Part of the problem was not only the parent's bad behavior towards their children, but that there was no accountability either. The first child abuse laws were written in 1974, and as with any law of this magnitude took forever to implement. Police and schools were still hanging onto the "stay out of your neighbor's business" attitude. Orphanages before this law were basically only for parentless children (and the service offered through a church.) Before this happened, people thought it was ok to beat up their kids. It was a cycle that perpetuated through each generation. Women were just starting to go to work in the 1970s, thus forcing their children to be the first latch-key generation. With women being able to work, they were able to leave bad situations ... but that also meant kids learning to fend for themselves. If you had a parent with a mental problem, you can bet they were a guinea pig for the next generation in being spoonfed heavy medication that didn't help
The point is, you can harp on about the past or you can see today as a new day and be thankful that we live in a society that gives people more choices than ever before.