I was wrongfully fired, how do I let them have it?

So, I was a theutic support staff for some kid with aspergers. So, I applied my 2 month training to my job, and did what I had to. But, then the parents start complaining, just cause I let him have the blame for any confrontation he had with other students. But facts are facts, and Aspies dont have the judgment capabilities to make good decisions. So, I tell his teachers that he is to be blamed for the problems and they do so. But, its true. So, we had time tests, and kids had to grade others. He marked something wrong, and said it was accidental. He was mean to anyone who would make fun of him, or any of that stuff. So, likewise, I let him have the full blame. There are reasons people gave him a hard time, and he was just paranoid. So, my boss tells me my ways are innappropriate, and am warned. So, I tell this kid my boss is a know it all. Then, I get fired.