That term - blooding - immediately made me think of Dave McGowan's Programmed to Kill: The Politics of Serial Murder * here's the passage it reminded me of:

Another common thread that ties the cases of these [serial killers] together is an early experience in the workforce that exposed them to the depravities that one human can inflict upon another. Kenneth Bianchi, for example, worked for a time as an ambulance attendant. So did John Wayne Gacy, who also was employed at a mortuary. Such an experience is what the intelligence community refers to as a ‘blooding.’ In a similar vein, the entire country is being ‘blooded,’ though on a lesser level, through near constant exposure to a television and video game diet increasingly dominated by scenes of graphic violence. The effect of this is to radically desensitize individuals, or an entire society, to appalling levels of bloodshed and carnage.

*Fair warning if you decided to read it. The first part of the book is called "The Pedophocracy" and immediately starts talking about the Dutroux affair and pedophile rings. Honestly, the book was one of the most radicalizing things I've ever read.