Sorry you’re experiencing this op. I’ve been on both sides...I managed a nursery with an exceptionally vulnerable toddler repeatedly hurting other children and now a mum myself who sends my own toddler to nursery.
The nursery are out of ratio and need reporting for that. They probably feel hugely protective towards this child knowing their history and wanting to give them a chance, I too would have supported other mums to find another nursery for their child rather than lose the vulnerable child.
As a mum I would find my child being hurt incredibly difficult and would too want to move them.
The thing is, all you parents getting upset is understandable but isn’t actually helping anyone, not the child, not the nursery and certainly not your own children as the nursery have (rightly) said this child’s going nowhere.
In your position I’d move on with good grace and if I were to stay, I’d try to challenge the other parents a bit, and reach out to the c
Carers/child with a friendly smile, a few words of kindness or a hello.
In our situation, the most complaining/unkind and I have to say bullying parent who tried to get the vulnerable child removed returned a few years later with a sibling and guess what...that kid was a biter!