because they would simply LOSE and look very bad. The law is crystal clear on this point; there's no wiggle room for them.
in addition to this, a lawsuit is very expensive for the school district and it sets a precedent. My school district hires external lawyers who are very expensive, I am told. And there have been cases where lawsuits that end favorably to parents are quoted by others while seeking accommodations for their kids. Due to many lawsuits, public schools local to me are trying to work with parents to avoid many more lawsuits.
