Who are you more concerned with? The gorilla’s life or the welfare of the child?
Both are precious. Human is not the most precious creature. Gorilla didn’t hurt the boy. I can’t understand why they shot the gorilla

What kind of precaution should public zoos have to prevent accidents like this?
For vivid experience in Zoo, the visitor wants to approach to the animal more and more. But It would be more dangerous. I have no idea. This issue is related with Zoo’s profit. As for Zoo, they are easy to bring a new animal. It’s terrible mind I guess = To enjoy the zoo experience to the fullest, visitors want to approach the animals to get a closer look, but it it very dangerous. I have no idea because this issue is related to the zoo's profit. As for the zoo owner's, they can easily bring new animals in.

What advice or tips will you give parents on how to take better care of their children?
Parents should have a training for taking care a child. = of their children.
If child is physically tied to parent such as = using dog collar, It = it would be very safe for careless people in anywhere.