I worry about that for my kids. Unlike an adult, if you're in an environment that's making your life hell (and normal school life is friggin' intolerable, from an adult perspective, without awful-yet-common levels of bullying or social bullshit happening), you don't have any real way to get out except to wait. Assholes can't be "fired". Hell, someone might commit battery and be back in the seat next to you before long, let alone lesser crimes. You can't really get transferred, with any certainty. You can't quit and go somewhere else, and anyway the environments are so screwed up you'd probably end up somewhere that's still bad, even if it's better. You can't even do much to avoid the jerks. The school work itself's a mess even in the best case, and wastes huge amounts of time—any bright kid's gonna notice and find it, at best, very annoying. You're not even being paid.
Keeping the kids indoors all Winter while the sun's out (recess is nearly dead around here, even at the good schools, and they avoid going outside anyway if it's even a little shitty) is dooming tons of them to short-sightedness (insufficient bright sunlight during formative years, turns out that's the main thing that does it), SAD, and probably contributing to obesity. It sucks.