Is our current theory around Stonehenge stretching the principle of charity considering what we found Aztec's sacrificing while having a far superior culture. I

Is our current theory around Stonehenge stretching the principle of charity considering what we found Aztec's sacrificing while having a far superior culture. Is it actually reasonable to make the assumption people were dead when cremated? Such a huge festival for which people travelled thousands of kilometers to witness. Does not sound compelling when bodies weren't stored to make it a big pile. The building took thousands of years, so crossing a considerable number of generations. Could it be the demand was such that no participation in the labour effort was basically your dead sentence? Or is Jesus officially attributed for the invention of the FOMO?