Why our ancestors drilled holes in each other's skulls

[Idris_A]

What I would like to know the most is the survival rate of this surgery, how did the brain survive this or better yet if people survived this surgery how did the brain evolve to function with a hole in the skull because filling that hole may never happen, and what's the difference between someone with a hole in their head compared to a normal/average person, so many questions, but in the end who thought that putting a hole in a person's head will help their pain or mental illness, and how they come to this conclusion. it's kinda fascinating/sad how people were willing to do this knowing that there might be a high chance of dying or if you survive you never will be the same. man people really have come a long way if you look back at it now.

What is really personally disheartening is that some people were not give a choice and we forced to do it just so they could be seen as normal and fit into society.
Imagine being forced to undergo a highly deadly surgery just because you were eccentric or different.