There is such a thing as abuse. Not everyone’s parents suck. Some beat their children, some love them. Sure, everyone hates their parents at some point, and it’s all relative. You’re making it sound like abusive parents don’t exist.
I love my job, and I love seeing positive changes in my clients. And I can confirm that it’s ~90% dealing with people whose parents sucked. The others usually experienced some kind of adult trauma or just want to explore themselves more.