Do you think so? Why?

It only takes one time of something happening to know that it needs to change. You're saying a design that only allows a child to fall in "a couple times in recent history" is good enough... I'm simply saying as a business that accepts money from people to display dangerous animals, that business should do as good a job as possible making sure those people are safe. For me, a child falling into a dangerous animals enclosure "a couple times in recent history" is "a couple times" too much.

I mean, it's a four year old kid. How can they have such bad design that a four year old can fall in? Even the fake ponds on my local amusement park with shallow water where you pay to drive RC boats has better barriers than that.

No need to say anything about society and putting the blame on someone else. I'm putting the blame right where it belongs. And you know what? The fact that they blew the gorilla away before it had a chance to do anything to the kid proves me right. And when "gorilla world" reopens, they'll have their shit together.

let those pieces of shit fall into a cage with tigers.

By your logic, literally everything should be significantly altered to ensure a 4 year old can't get hurt. Speaking of pools, better make sure no recreational pools over 1 foot deep exist in our country. After all, the kid could drown in it. Too bad you can't use the "their parents should be preventing that" argument being that you just debunked it saying it wouldn't be their fault this happened. The list can really go on and on. Stupid parenting and an idiot of a kid can cause extreme situations to occur. Significant costs do NOT need to be incurred to prevent these incidents, because the reality is, they (the business) are already doing a well enough job to prevent it in all but an extremely rare occasion. I really suggest you read a book called 'The Giver'. They try to create a Utopia by essentially taking all pain away from people, but it isn't nearly as great as it is made out to be. When we continue saying businesses are blamed for essentially everything, and that we need more and more and more safety precautions, we really do encourage stupidity, because you'll never be at fault for it.

Just recently(in mexico), there have been street poles with heads of wolves tied unto them. Don't see why there isn't any outrage for that. https://www.rt.com/news/344972-wolf-beheading-spain-hunting/