AITA for going extra on my deaf/special needs nephews special needs school when he didn’t come home, and we found him at a homeless shelter?

My nephew has been attending this school for years. He is deaf and is autistic level 3. Level 3 autism, or severe autism, is the highest severity level on the Autism Spectrum Disorder (ASD) scale, characterized by profound challenges in social communication and extremely restrictive/repetitive behaviors that significantly disrupt daily functioning, requiring "very substantial support" for individuals to manage life across most settings, often involving nonverbal communication or very limited speech and significant difficulty with change. My nephew was explaining to staff that "He’s disappointed because he did not get a good grade in a class. He did not want his parents to be disappointed in him." (His parents are very understanding.)What the school heard, was that he was scared to go home. My sister in law, received and email "Hello, we have been trying to contact you, but (ALL) contacts are saying out of service. your son will not be coming home, and he does not want you to know anything about him right now."After receiving this email, she tried to call the school, no answer. (Anyone who is aware that Verizon had a huge outage today and service was out and still out being worked on.) They did NOT try all contacts because I am one of them.Let me explain that he is 18 years old.Being said, you can clearly imagine how hard it was to get any answers within the following hours. Phone calls with no info. Let me circle back, while he may be aged 18, he has child like mind tendencies.At 7:05pm, I had received a phone call from a private number that was from a sherif deputy. "This was a very uniqe call for her to be on but that he has been put up for the night and he is in a safe space.The police came to the school to pick him up brought him to a church for a community dinner, guided to a bus to get on, and was brought to a homeless shelter.A special needs child was dropped off, left alone with no communication, no information,Nothing! He is deaf and needs an interpreter. He does not handle social situations very well, and yet the school thought is was a good idea to do this to a child whome they have educated for YEARS and knows who he is as a person, put him in a VERY dangerous situation! We got a call from a friend who just happened to be at this shelter for the night, and said he was there. The staff was placed on the phone with my sister in law and explained everything that they knew about the situation (which was nothing!) The staff had asked if we wanted to pick him up because they weren’t sure what to do with him in the morning. So we got in the car to go and drive an hour out to pick him up. Because he is deaf, they communicated with him on a peice of paper. He told staff that"I just want to go home." "I’m scared." "I miss my mom and dad and my family." " I miss my brother’s and sister. Their names are (gives names)." "I want to go home to my family. That’s where love is." We plan on taking this to the full extent with lawyers and courts.