Most parents have no fucking idea. They're too liberal, give kids too much freedom and don't think of the impact on their brains. Years ago I was in a video shop and the idiot mum was asking the clerk about horror movies for her 13 year old. No idea with how they damage the developing brain. I had to interject. She was horrified but out the videos back. Ignorance might be bliss for adults but it hurts their kids.
And those same kids, we have to put up with them when they're adults, and hope they can run the world. They aren't just the parent's kids, they are the world's.