Yeah, the kid’s standing on top of an 8-foot-or-so wall of rock, with a dug dry-moat at its base. See 3d Google Maps view with kid’s position marked at https://goo.gl/maps/A9ewZeqU8j22
The only way the kid could possibly be in danger from one of those rhinos is if Gramps lets go of him and lets him fall into the moat.
And it looks to me like Gramps has a pretty firm grip for just that reason.
I’m not condoning this, but the Internet’s outraged rush to viral judgement based on a single photo is pretty impressive.
Especially given the necessary assumption that that flimsy welded-wire-sandwiched-by-2x4s fence is all that protects the public from the rhinoceri.
That would have to come from the Really Dumb Design Department, and I’m not sure the Dublin Zoo has one of those (-: