Humans are animals too.
If these people just looked at the very well documented situation.. read the zookeepers reports and examined all the facts..
.. The gorilla had to be put down. It’s a shame. The whole thing is a shame. But people act as if nothing was done or thought of before some “gun-nut just shot him and laughed the whole time and for no reason”
The zoo really, really wanted to find a way out of the situation without losing either life.