Situations like this really hurt the credibility of zoos. A lot of people completely disagree with zoos in general. And the zoos response is that they do conservation research or other forms of non invasive research. Then they are forced to kill one of their animals. Good job guys...
While I don't think the parents should be allowed to sue them I do think the zoo should be fined by some regulartory body and forced to completely re-evaluate and even redo some of their current enclosures with potentially dangerous animals.
I know they don't want to the zoo to look like a prison but look what happens when the enclosures aren't secure enough.
Thats what you call Gorilla glass! haha