HaKatan:
Wrong approach. Removing a child from a cheder because of unsafe conditions allows the problem to continue and expose countless other children to risk. The proper approach is to make contacts with those who have jurisdiction and “force” the yeshiva to take measures to make the environment safer. If this yeshiva is part of a chassidus that has a rebbe here, find someone to approach that rebbe with the issue. Perhaps gathering a group of parents, instead of just one parent alone may make greater impact. Having other askanim who carry soome clout make the connections with the hanhala, etc. You get the gist.
Taking your child out saves your child (unfortunately, that’s all we can do sometimes), but there must be a strong effort at correcting this irresponsibility.