Spot on. There are a lot of people in every era who assume that whatever the dominant moral set of values is must be the most logical, most conclusive set of morals ever developed, and are immediately willing to make those values mandatory and enforced by violence.
Hundreds of years later people become disgusted with behavior that wouldn't even remotely register as immoral at the time. Sometimes I wonder what will be unthinkable in future societies that we don't care about today.