We can, but it is pointless (the culture is now dead and gone) and it does raise questions about objective and absolute morality, of which many people disagree.
It also can easily lead into very messy discussion about modern day actions which in some sub cultures (and other cultures that may one day exist) would look equally horrendous. For example, we often are fine with abortion because of our standard as to at what point a human counts as a human. How can one objectively say our standard is okay, but someone whose standard is to not start counting til a year old isn't?
Or to bring up another hot button issue, look at MGM and the differences in how it is treated compared to FGM. You can barely even mention these concepts without risking a flame war (that is still a term, isn't it... feels like I never hear anyone use it anymore).