Hi All,
I'm kinda catching this late,but...Celtic tribes of Gaul, had a history of not only scalping but drinking from the skulls of enemies as well. Another was having an enemies head as a trophy.( One legend had a Celtic heroes" head talking to his foe,giving him advice and making him crazy,lol).
The practice was done as a religious form of "taking the strength of your opponent". It was thought that a persons strength and soul were housed and flowed from the head through the hair. By taking or ingesting from ,or ornamenting with said items, you were gaining more strength and higher abilities through nature .( A practice that flowed through most cultures,like thanking animal spirits for the nuturing benefits they have given).
You can read bits of that in minor threads in Jean Markales' Treatise called " History of the Celts".
( He was a French Historian and it may be hard to find the English version).
It was no wonder that Native Americans and Celtic peoples were so kindred. These cultures respect for the natural world was reknowned.
There are other examples from many cultures since the beginning of recorded history. In some cultures, angles are the barbarians for being so out of touch with nature. Touche!
If I am too late and out of touch with this response, I apologise,but I want your son to know he was right to be agitated. Go Boyo, Knowledge is power which leads to quiet dignity.
Monk