Also don't think any parent would consent to their 4 or 5 year old going on a school trip if they thought zoos were such dangerous places that if the teacher turned their back for a minute, one of the kids could crawl through a fence and find themselves in with the lions
My children go on excursions because I trust the teachers to watch them. ANYTHING could happen, things HAVE happened. If my child ended up in an enclosure because a teacher wasn't paying attention, would I want that teachers head on a stick? Damn straight.
If you can't supervise children & ensure they don't come to harm (over & above the normal scrapes etc) then perhaps you need to rethink your strategy.
The parents, imo, are at fault. He indicated what he wanted, yet he was still able to get in. I am not saying that the zoo didn't perhaps make it easy for him to gain access, but I would see his request as a red flag. Doesn't make me a perfect parent. Just one with common sense.
I really don't understand why you are never allowed to criticize parents who put their children in harms way on MN. Some parents are idiots. Their choices lead to children getting hurt/killed, yet we aren't allowed to say one word against them.