Sometimes less is more, but in this case I think I would give a reason. I would just state something simple though, such as "behavior is detrimental and dangerous to other children". That may be enough to make them think about it.

IF you WANT and you think it may work, you could do a probation period. Sometimes that helps. But you would have to list the time frame to revisit it, and state on it exactly what you need to see change (pick the worst behaviors). You are not in any way obligated to do this though and would only be if you think the parents would take heed. It also would depend how severe the behavior is.

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