One of those unfortunate things?

Where do you stand on this shooting of a gorilla after a young boy fell into his enclosure?  OK this was in America and not strictly within my remit, but the basic problem does I feel, transcend borders.  It has been suggested that the gorilla was posing no threat to the boy, and indeed was probably seeking to protect him, and therefore its death was unnecessary. Certainly was a shame he had to be killed, but what was the alternative?  Take a chance?  What if the boy had come to harm - what would people be saying now if that had happened?  Clearly the gorilla is in no way to blame for what happened - the blame, if indeed you see it in those terms - lies partly with the zoo, who should have made it far more difficult, if not impossible, for anyone to get into the enclosure, and partly with the parents, who should have been far more aware of what their little boy was doing.  It's always very easy to be wise after the event.