(((Aimless Soul))), even though you could not write something down, your thread title actually says a lot. The answer to your title question is that sadly a lot of parents don't know they are interacting with their children in ways that are harmful and dysfunctional.
It's actually not surprising that you would ask that and then not even be able to write something down either. Often there is a lot of emotional challenge taking place where it's overwhelming to try to put what you are feeling into words.

I have spent a lot of time with different families and over the years I saw parents behave in ways with their children that often shocked me and these parents genuinely had NO CLUE how their behaviors were so damaging to their children either.

Unfortunately, a lot of people have children simply because that's what comes next and they genuinely don't have any idea how to raise a child or even the stages of development children go through and how to nurture children according to whatever stage of development the child is experiencing. We have been living a lifestyle where children are often handed off to daycares or nanny's and the parents don't actually form very important bonds with their children too. A lot of people have children without any idea or knowledge about actual stages of child development. As a result a lot of children end up struggling as a result of "emotional neglect". The parents begin to have problems resulting from this and NOTORIOUSLY handle this by making it worse and punishing their child for something the parents themselves caused out of shear ignorance. Parents don't typically set out to abuse or neglect their children, most of the time the reality is that the parent has no education or actual knowledge and often make a lot of mistakes which results in their child struggling and confused.