I understand what you’re getting at.
That's old testament. JC changed the game. Thus-if your a Christian-you can't own slaves.
for context about Peter-
After commanding all Christians to submit to every human authority, including emperors, kings, and governors, Peter specifically says the same to Christian servants (or slaves) about their masters. The word used here is not the Greek douli, the classic term for "slaves." Rather, it is oiketai, probably best translated as "servants." That being said, the line between servants and slaves was blurry in Peter's time. Slavery had little to do with race, as modern readers often process the idea, and more to do with economics and social class.
Slaves consisted of those captured in war, those born into slavery as children, and those who had sold themselves into servitude for a set time. Some "slaves" were highly educated and served as artists, accountants, skilled craftsmen, etc. Others worked under terrible conditions (in mines, for example). Many suffered significant abuse; few reasonable legal restrictions existed about the treatment of slaves. Slavery in this era was completely normalized, and a large percentage of Peter's readers in the early Christian church were slaves and/or servants of one kind or another.