You are a patient person and understanding person
. I would be concerned and want a plan of action for the center regarding the rules of playground for the different age groups. Seeing those rules and how they are being enforced would be a part of my plan if I was going to keep my kiddo there. I would also want to know more about how the after school program handles special needs "inclusion". Often some of those children require the attention of a specially trained set of individuals.
Accidents do happen, but this is happening frequently.