Rare is the parent who can recognize and/or accept that his/her child is not putting in the necessary effort to learn. It is so much easier to blame the school/teachers.
When we had a child in government school we had to teach her in the evenings because it was not happening at school. The school was more focused on getting and spending. The last year they didn't give textbooks. They expected them to use laptops and smartphones. To get time with a textbook a kid had to stay after school.
My high school calculus teacher blamed teachers who got degrees but never learned to teach. She used textbooks and a chalkboard. None of this expecting gadgets and media to do the job. She was usually teacher of the year.
There are plenty of kids who don't get the necessary parenting. Often it's because parents have to work to much to pay for a life plus high taxes. Some are indeed just animals, but that does not answer as to why the schools are failing overall for all students. It's mostly a government school system not focused on teaching
