“The verse you referenced indicates that murder of a slave is unacceptable, not that slavery is acceptable.”
So, you are interpreting the bible by reading it the way you want. I read it very differently and concede that when the bible was written there was a very different view of slavery than there is today. But in either case, we are interpreting, which I think is acceptable. Those who say one should take the bible literally do as much interpreting as those who don’t take it literally.
To be clear, I will stipulate that some Christians do interpret the Bible the way they want to or believe they should or have been taught to do and then use their interpretations to argue for or against moral or scientific issues.
What I am arguing is that it is erroneous to interpret the text of that particular verse as an endorsement or condemnation of slavery.