Pretty sure I was retaliated against at work

I live with my parents at the moment. I'm not proud of it but it's what I have to do. I work as a kitchen staff in a juvenile detention center. Was the only job I could get. Some of those guards are complete assholes. I think they retaliated against me because I made a report to HR and CPS because there's this guard who is very abusive to the kids. Delinquents or not they're kids. The final straw is when this asshole got mad at a child (about 15) talking back so he rips this kids jump suit off him in the middle of the cafeteria and then beats this kid in front of everyone. I step in. This person gets mad and tells me to mind my business. I was let go from my job today and I feel like it's retaliation.