I'm in a position where I actually KNOW better. Many of the parents I come in contact do NOT know any better and they accept whatever the school or "professional" tells them without fact checking or doing any research themselves. I don't mean this negatively but I do find it a tad humorous that you suggest finding another school. I've had parents who had to take the school to mediation and/or due process for the child to change schools in the SAME school district.
My point is not to say that you aren't 100% correct that individuals can receive adequate and appropriate services, my point is that it is a bit naive to not recognize (as your initial response seemed to suggest) that the process for receiving such services, as a child or an adult, is neither simple nor easy to access for the average individual.