If some of the alternative archeological assessments are correct
{which I for one believe is true}.... The last thing they needed
was rain!
This culture flourished before and survived one of the "pre-archaic
great floods".... like between 20,000 and 9,000 years ago!
That is when all that was left to live on in this area was the mountain
tops - that are now at 12,000 to 15,000 feet of elevation - sticking out of the oceans!
If they were stabbing folks back then, it was more likely to stop the rain!