One of the best books I have ever read is The Hummingbird and the Hawk. There was a General named Tlacaelel behind the Aztec throne that instituted much of the sacrifice and slaughter long before Cortez arrived. Tlacaelel advised and influenced Moctezuma I and Moctezuma II. At the height of the sacrifices, there was an immense double pyramid, and the blood from the bodies (hearts torn out of living subjects) flowed down the steps of the pyramids. It is no surprise that they are finding skulls.
The Mexica threw their sacrificial victims off the top of their pyramids. The victim’s heads went on the skull rack, the hearts into stone receptacles inside the temples to be burned, and the limbs were harvested for the post-sacrifice feast. Human flesh was a prime source of meat for the Mexica.
The Mexica priests covered their heads and bodies with their victim’s blood and never washed it off. According to the Spaniards the temples, and the priests, reeked from the smell of death.
The pyramid stair-steps were stained red with blood which could be seen from a great distance.
But, “all cultures are equal” as our Leftist rulers constantly remind us.