They should have really thrown the mother into the enclosure and when the gorilla went after her they could have saved the kid.
I get that mistakes happen but come on...that kid did not set a world land speed record getting into that enclosure...that woman was probably on her cell phone or something ridiculous and lost track of her child.
Jeff Corwin put it the best-
"zoos aren't your babysitters, put down the phone, the selfie stick and connect with your child instead".
Same stupid thing happened here in Pittsburgh...mom dropped her freakin' kid over the railing of a wild dog enclosure and the wild dogs did what wild dogs do...attacked an easy meal. Zoo officials killed all 12 dogs...for what? Being wild animals? Makes me sick...those animals didn't get out and go on a killing spree...that mother killed her kid...and nature suffered.