If there is a safety issue in ANY place my kids are (or any kids or myself) I alert the staff/management or whoever I need to in order to make sure my kids are safe. To me it's common sense to do it.
What good does it do to come on here and complain if you haven't tried first to let the school know there's a problem? If you have told them & it isn't fixed then complain. Until they know about the issue the kids safety is an issue. If you know there's a problem and don't report it doesn't that make you responsible too if someone gets injured?