Did the majority of people living at the time feel like it was okay? Is it okay for you to second guess the judgement of thoughtful people who understood the context way better than anyone does now?

If at some point most people believe that killing mammals for food is monstrous, and it is banned, and children learn with horror about 21st century practices of murdering and devouring millions of cows and pigs each year, will that make it wrong to eat a hamburger now? Will eating a hamburger now be okay if that never happens? I certainly don't feel that the moral value of my actions should depend on the beliefs of people living hundreds of years in the future.