Right Wing Nation tells the story of a Colorado Springs (my adopted home town) special education student who was molested by a boy who was, for some unknown reason since he was a minor and untrained, assigned to watch and/or assist the girl. And according to the parents, the school district tried to push the assault aside and then hush it up.
If the story as told at the link above is true in its specifics, then the school district people involved in this issue are bastards, every single one of them. If only they could be held individually liable for their parts in this travesty.
This story reminds me of one told in my high school psychology class by our teacher, Mr. Bettis. One day, much earlier in his career, a "retarded" girl (that was an acceptable term back then) walked up to a very popular boy on campus and laid a pretty heavy kiss on him, right on the lips. The boy was so mortified that he actually decked the girl. An investigation revealed that this boy was one of several who, recognizing the girl's mental state and knowing she'd be easy prey, had each been having sex with the girl--and as payment they'd give her a pencil. Mr. Bettis would angrily reinforce that last point, "They were screwing her for pencils!" The girl, not knowing there was anything wrong with what they were doing, saw this boy and went up to kiss him, apparently as she had done during one of their interludes. As I recall the story, several boys got in heap big trouble when the facts became known.
Molesting the helpless. Does it get any sicker than that?