You're arguing that exceptions and rare occurrences in American slavery are equivalent to the norms in Rome and for some reason trying to make American slavery seem like it really wasn't all that bad.
Your style of responding also makes it seem like you're arguing the point that slavery wasn't all that bad in the US from a very specific view point
They're rare occurrences in American slavery and they're also rare occurrences in Rome.
As some other people have pointed out, if you look at objective indices of quality of life, the United States generally comes out as possibly the best place in all of history you could have been enslaved.
Your style of responding also makes it seem like you're arguing the point that slavery wasn't all that bad in the US from a very specific view point