Emperor Hadrian randomly stabbed a slave in the eye in a fit of rage and he was supposedly unusually sympathetic to slaves.
There’s other instances of people randomly punching slaves that they didn’t even know because they got in their way or something. This was just normal behavior.
And slaves didn’t rebel en masse because if even one slave committed an act of violent rebellion it was common practice to kill every slave and former slave in the household.
People only took notice for posterity when these mass executions got into the hundreds of people. One of the few recorded for the history books is of over 400 people being killed because one guy stabbed his enslaver.
Like how many people throughout history were beaten to death because some rich asshole was angry and there was no legal or social consequences for doing so? We don’t know.