it's not like the zoo is one person
it'd probably better emotionally for everyone if the law suit went through and won, that way the parents can pretend it wasnt their fault and not have to live in utter pain for the rest of their life and the zoo won't feel as bad as they would because a. the zoo isnt one person and b. they aren't the parents of the child
I said an innocent, the zoo, meaning the group of people that thrive on the paychecks they get from it, is innocent and has done nothing wrong, if the suit went through, the zoo would assume responsibility for that child's death, would most likely be shut down, or at the very least lose all popularity it ever had before that point, and be required to pay the parents a very high monetary sum, you make it sound like these people just have money to throw around freely.
People would be out of work, and the whole situation would, in the end, be an injustice many times worse than what has already happened.