It took until the second century for there to be any restrictions on a Roman killing one of their slaves. For a while after that they just had to have a reason.
That paints a clear enough picture of what was going on.
And yet for those without family, there was nobody to prosecute their murder even not being a slave. If you had no real legal protection anyone could kill you. If you were a slave, only your owner could. That's still a major step up.
That paints a clear enough picture of what was going on.