The old "I won't raise my kids like my parents raised me" problem, which inevitably seems to lead to raising kids with a different set of grievances and unresolved issues.

I realised it was a lost cause when I realised that literally everyone I knew had some sort of "my parents are imperfect and it's broken me somehow" story. I think it might just be part of the human condition to grow up and realise your parents were flawed humans who made mistakes raising you.