I have a theory. There was a residue of memory passed down from when people first originated from aliens, aliens who had sex with neanderthals. This memory, probably passed through their genes, was thought to be “sacred” and to show their respect to their alien ancestors they created these pointy skulls. Some also created flat skulls of their neanderthal ancestors too.
Can this be proven through Hegelian logic? Perhaps not. But there was an Hegelian professor who died with an elongated head in Berlin in 1833 at the height of European Civilization (as claimed by Hegel’s understanding of Absolute Spirit). He claimed that the elongated Norman Cathedrals in Europe reached up to the stars and God. Could God be aliens? Interesting question for our age.
Getting a whole population to do something stupid, odd, or counterintuitive to or with their bodies is about establishing control over them. That's much more likely as explanations go.
No.