I know plenty of people who did support slavery and it’s a product of the time. Also, the Torah literally does support chattel slavery Canaanite slaves didn’t have any protections in slavery. American slavery of the blacks was essentially the same as Canaanite slavery in what the owners could do to them.

To my understanding (of laws meant to prevent overt mistreatment of slaves) this only strictly applied to Hebrew slaves and non Jewish slaves did have more restrictions but was still allowed technically. Also this may be because we don’t have a temple or a land anymore to call ours, and our batei din don’t have any actual control so slavery could get out of halakha. The Torah does literally accept chattel and all of our sages supported it. Torah is always moral and if you think otherwise then you think God is below time, obviously.

Hebrew slaves and Canaanite slaves did not have the same rights, Canaanite slaves were literally allowed to be forced to have children and then those children would have been slaves for you.