I don't see how it's much different than dog fights. I don't see how any two animals fighting and killing each other is considered a "sport" and entertaining to watch. We're back to the Roman Coliseum days as a culture!
Modern society is based much of Roman (and Greek) inventions at the time they were empires. From aqueducts to coliseums, how much of democracy works, city planning, even having running water (aqueducts) and more.
The Renaissance is basically applying once again many of the Roman emphasis to city building and architectural design. The Neoclassical architecture which is seen as a type of grand architecture that a great city must have to create a sense of urban grandiosity is based on what was used by the Romans and the Greeks. Even the usage of cupolas is a Roman invention.
A sign of cultural refinement, advanced civilization, something to aspire to.
Just because you don’t like something doesn’t mean it’s necessarily wrong. It simply means thag you don’t like it as I don’t like mint tasting ice cream and that’s that. No one is obligated to go to a cockfighting ring and watch a match in the same way no one is forced to go into a gentlemen’s club and see women in skimpy clothes, bikinis or less.