because humans tend to gather the dead bodies of their parents or children not too far from one another.
The search engine does often bring up cemeteries dated at about 4,000 or 5,000, but not at 30 or 40,000
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You actually might want to try some basic research before you spout nonsense
quote:
Burial customs varied widely from tribe to tribe. Indians disposed of their dead in a variety of ways. Arctic tribes, for example, simply left their dead on the frozen ground for wild animals to devour....Southeastern tribes practiced secondary bone burial. They dug up their corpses, cleansed the bones, and then reburied them. ..Northwest coastal tribes put their dead in mortuary cabins or canoes fastened to poles. Further south, California tribes practiced cremation. In western mountain areas tribes often deposited their dead in caves or fissures in the rocks. Nomadic tribes in the Great Plains region either buried their dead, if the ground was soft, or left them on tree platforms or on scaffolds. .. But during outbreaks of smallpox or other diseases leading to the sudden deaths of many tribe members, survivors hurriedly cast the corpses into a mass grave or threw them into a river.
Source
This is just native americans. This took me less than 1 minute to find. I am sure if I spent 10 mins I could find dozens of other death rituals that do not meet you claim.
Facts don't lie or have an agenda. Facts are just facts