“NO RISK means NO RISK. Otherwise no one will go to the zoos and there won’t be any zoos.”
If that were true, then places like DISNEYWORLD and SIX FLAGS wouldn’t exist.
There is no fun in an AMUSEMENT PARK if there are NO RISKS.
We pay money to be put into machines that stretch RISK to it’s limits. Sometimes something breaks, and people get hurt.
The difference is that they don’t SHOOT the ROLLERCOASTER after it kills someone.
Zoos tout themselves as "friendly" and you never see any of them point to the threat posed by the animals.