But there are eps where we see the school district realizing the problem and potentially offering better support. For example, and I forget which ep this is, but some bad kid nominated Hanson and Kate (I think) to run for student president. The students had, at that point, progressed to having lunch/recess with the other kids.
Before the Buseys, the class is briefly referred to as the remedial class in a couple of eps; namely, Tutoring Reese. We see what may be the infancy of this class at that point. Later on, we see the Busey program has morphed even since then, and maybe in the course of that year, the administration has made more improvements.
I think the only teacher corruption lines we can draw lie with the middle school principal. The high school principal is just a big jerk, not corrupted; and there are lots of teachers (e.g. Caroline Miller) that mean (or in the case of Caroline, meant) well.
I don't think you can assume that every home is filled with doctors and lawyers; this is coming from Hal, who obviously is going to feel that way. Where I live, those types of homes are not for doctors and lawyers. But maybe there's one or two low-on-the-totem-pole "professionals" in the neighborhood that make Hal feel inferior.