This is a really dumb response. The replacement for slavery is the same work just paid and without ownership of the workers.

The police are already paid, and they do things that are genuinely neccesary like crisis intervention and investigating legitimate crimes (not busting pot dealers and ticket quotas), they just do a bunch of evil and corrupt shit on top of it (and usually do a shitty job of the neccesary things as well). There does need to be something to replace those roles.

To be fair, OP’s post is also a really shitty analogy because of those reasons as well.

Rhinos have a temperament similar to dogs. As long as you don’t intentionally fuck with them they’re typically chill. They’re likely friends and playing otherwise I doubt the zookeepers would have let this happen.