Did I do the right thing?

I need some advice. For just over a year now I have been taking my little one to some play group sessions. In the last few months as I have been taking them to the ones with older kids, I have had several times where my child has been on the receiving end of other children older or same age getting physically aggressive. This has also happened at nursery where they were bitten by another child. Whilst I am pretty proud of them for not retaliating at all, I was getting worried as there has never been any apologies or recognition that this is happening at these groups. I am also contemplating not taking my child to them anymore as I am scared they will be grabbed/hit again. But I don’t want to do this as we both always have a lovely time and they have made some good friends there. So I contacted the place the groups are held to let them know all that’s happened and if there was anything that could be done to prevent it from happening to anyone else’s children. I am now worried I have done the wrong thing and will be treated differently or looked at in a bad way. I am in no way trying to offend any other parents for how they raise their kids, and I understand fully that these things do just happen, but I felt I needed to stand up for myself and my child as it was really started to upset me. Was this the right thing to do or should I have carried on keeping my head down and say nothing?