It is over the top, but worst experiences tend to overshadow the rest. If someone beats you, odds are you won't forget that humiliation for a long time. Ideally, people should not get beaten in school at all, much like we do not tolerate the same in a regular workplace.

Some schools manage to prevent that, good for them. Those that cannot or are unwilling to do so, will end up as bad examples in conversations.

Yes. But again, people who push for homeschooling were not all beaten not witnessed traumatic things. Quite often it is religious or political. Or living in group where it is normal.

Or sometimes having special needs kids - but these people don't need schools to be awful. They have that special need and tend to focus on that.

If we want to use the worst examples as the example to measure schooling by then I think the worst examples of home schooling should really be emphasized here. Wasn’t there a case recently where a white mother of adopted black children took and homeschooled her children after teachers tried to report possible abuse- and then the mother later went and killed her children and then herself? I believe that was the background to a popular image of a black child hugging a cop and looking into the camera with tears in his(the child’s) eyes.