They were going to, but ultimately he was just exhibiting natural behavior and unfortunately the person broke the rules - only 12+ year olds were supposed to enter the park

Those with organs for judgement are found as liabilities when said judgement structure is faulty and they can be responsible for damage.

Those which are structurally whimsical - well, if you had to deal them as liabilities, then you would have to do it preemptively (it may not be that it's Chimpy that is so brutal - they just can be brutal).