Even the golden twinkboy King David pissed off HaShem at some point! And let’s be frank, HaShem spends like 95% of Deuteronomistic history pissed off at the children of Israel.

That said, it cannot be denied that (a) people at the time of the writing were a lot more tolerant if not outright favourable to slavery and (b) people have used these books to support or at least normalize slavery throughout time.