This girl was apparently so cognitively disabled that she's unable to give consent, so any sexual contact with her is essentially rape.

WTF?

...is whether the attackers were capable of forming criminal intent.

and they know what no means.

I don't, however, support throwing them in jail for this.

My concern, because of the statistics I posted lower down in this thread, is that perhaps there are reasons why they are exhibiting this behaviour, and THAT needs to be investigated.

Isn't this at the bare minimum a pretty clear-cut assault? For special-needs teens, this attack shows a good amount of premeditation...

Excuse me, Mr. police officer man, but... WHAT THE FUCK IS WRONG WITH YOU?!?!?!?

How does that even... who could... I feel dizzy.

If these kids are beyond being able to know right from wrong who was in charge of watching over them so abuse didn't happen? Where were they?

Those boys do not belong in any situation where they have access to someone they can sexually abuse. Low IQ does not make someone a rapist. They need to be addressed and never given opportunity to do harm again.

That was present was fired. Maybe he/she was supposed to be there and went to the restroom. Or maybe just couldn't stop it and panicked. Who knows. Obviously something went terribly wrong. I don't get why people assume that the mentally disabled don't have the same biological urges as every other human being, for one thing. And if their condition is so severe as to preclude the ability to form intent then it follows that a much greater degree of caution and security must be exercised, especially in a coed situation. Our duty is to protect them and nurture them, give them the best lives they can have.

Wiki:

"According to research, more than 90% of people with developmental disabilities will experience some form of sexual abuse at some time in their lives. 49% will experience 10 or more abusive incidents."

as they couldn't form criminal intent.

If the students cannot be held accountable for their actions, they obviously needed far more supervision than they were getting.

The boys couldn't have formed intent (apparently, but that will have to be proven by outside experts) but that means that after a certain age they should never be allowed to have dominance over girls. Maybe not even have contact with girls in the school if there isn't adequate security provided. Supervision may not be enough in a situation like this.