What you are saying is too simplistic.
Parents are not perfect, nobody is.
But there is big difference between regular parents who don't get everything right and abusive/neglectful parents.
Of course people who grow up with parents who are alcoholics, drug users, mental health conditions or within an household where abuse and/or neglect take place are going to be negatively affected.
This the time where your brain and identity is formed and if you grow up with parents that don't give you support and a heathy environment you are going to develop things like poor self-esteem, body image and a distorted view of what healthy relationships are.
A lot of that stuff used to be swept under the carpet (you only have to look at historical instances of child abuse) by parents and the authorities in previous decades. Now people feel they can speak more openly about it and it is taken more seriously.
I grew up in an household where I was physically and mentally abused and it has affected my entire life. My parents also badly neglected my physical health as well and issues that could have been addressed and corrected in childhood were not and left me with lifelong disabilities. So of course I am going to put the blame on them for making my life harder and sadder than it needed to be. It also affected my ability to have healthy relationships in adulthood and took a lot of therapy work.
Abusive parents should never be excused with ''oh well they tried their best...''
When you are a kid your parents have all the power, you cannot just move out and ''divorce'' them like you would if you were in an adult relationship.