Thanks for what you do. I understand your concerns. In the end, the kids are the parents responsibilities, not the teachers or the schools, no matter how responsible you are or feel for the kids you deal with and others in similar situations, or feel you as a teacher or school system person feel people may hold you responsible. It just isn't so. Don't let it be a burden, you should not have to carry.
Again, I think the school officials will be fine and that they acted responsibly with the amount of actual knowledge of the kid, they had at times that would make a difference. I am sure, my grandmother would have agreed. She retired and drew separate retirements from teaching in Kalamzoo, MI, as well as Missouri, and of course Tennessee.