RIP little one. I hate these stories.
These stories are dreadful and preventable. Ignorance is behind this willful blindness, just as so many close their eyes with respect to Islamists. In either case, you may be able to selectively breed out the trait over a long period of time. The inbreeding curse, however, insures perpetuation of the lust for blood trait. The gene is like a built in bomb that can go off at any time for any reason. One day the Islamist is going out on an operation with his American 'buddy,' defending him in combat and the next day he points his gun at the same American and blows his guts out. Same is true with the pit.