Boy fall's into a gorilla enclosure. Argument.

On the 29th of May 2016, a 4-year-old boy fall's into a gorilla enclosure and they had to shoot the gorilla to save the child. But I think that it was the parents fault, reason being that the parents were not watching their child and they should have been keeping an eye on their 4-year-old boy. But I also think that it was the zoo's fault as well because they should have made the barrier higher so that children could not fall in.  So please do check out this video, to see what happened: https://www.youtube.com/watch?v=Zfuz7cTDNeI