In the meat industry, animal suffering is not the goal. The goal is to deliver as much product (food in this case) to the consumer as cheaply as possible. Animal suffering is a byproduct of this because on a large enough scale, both the consumer and the capitalists running the slaughterhouses are far enough removed from the animals that they don’t have to confront the moral questions of what they’re putting these animals through.

I agree that it’s still a disgusting practice, but it’s not the same thing as deliberately harming animals for your own amusement. In the meat industry, some people can hand-wave those moral concerns away by saying to themselves “at least the animals died for something good: to feed countless families”. Whether you agree with that reasoning or not (which, for the record, I do not), that same person can’t use that excuse in the case of these monkeys. It’s just pointless suffering for the amusement of a handful of psychopaths.