There was a point to be made about the roman empire that I didn't feel like making for wuf and that's that the decline of gruesome killings as a form of entertainment is largely contributed to the spread of christianity within the roman empire. On the other hand you have largely christian countries like the US where black people were victims of mob justice by the thousands up until the early 20th century. That includes stuff that would have been a little much for medieval europeans even.
Easy come easy go.