I think it works both ways tbh.
Of course parents should be accountable for how they behaved and be prepared to apologise. That is so important. No one is the perfect parent!
But equally, and from the perspective of a tail end boomer, I think adult children forget how much time, tolerance, patience, money, and personal sacrifice goes in to raising children.
Do any adult children think of the broken nights, nappies, tantrums, sick bowls that went in to the early years of raising them?
And the endless school runs? And extra-curricular activities?
And what about adolescence?
Young adults can often have very little recall about how incredibly thoughtless and self-centred their behaviour was as a teen! Even as a teen they don’t remember! They can be kicking off about something one minute, so much so that you would be walking on eggshells around them, and ten minutes later they had forgotten all about the argument while you were still tense about it! 😀
Do people remember the financial sacrifices their parents went through to pay for that special school trip, longed for bicycle or computer, or study programme or first car? Your parents probably never even mentioned it to you!
Of course we love the very bones of our dc and we would do it all again in a heartbeat but I feel sad about this modern trend where all everyone remembers about their childhood was how hard done by they were!
Obviously if you were physically or mentally abused as a child then that is a very different matter and I would never condone that. A child in that situation has every reason to feel upset and angry.
As you say op, most parents
try to raise their children to the best of their ability, according to the societal norms of the time, and according to how they were raised.
I was raised in a very strict religious household in the sixties and we were smacked and shouted at. I remember being fearful of my mother’s shouting. And I resented her for a long time, But now I am much older myself and have raised a family, I am much more understanding of her and think she was overall a great mother! I only wish I had appreciated her more at the time!