This goes back to the parents who aren't taking their child to doctors for health checkups for any myriad of reasons. Early and often checkups should catch these issues. In your example I wouldn't say parents don't give a shit. But as someone who had ADHD but didn't cut up in school or wasn't a class clown, I had discipline at home. Sure I would talk during class and my mind would wander. But I wasn't being so disruptive class couldn't be taught.

Almost always in the examples of why teachers don't want to teach anymore. The focus is always on pay, testing, and administration. But who wants to come to work and teach children that are so disrespectful and so disruptive that class can't be taught. My salary wouldn't be the deciding factor here.