Seems kind of weird to me, with no genuine good reason for it — plus, we would not know without examining the carcass whether it’s infested with something. I’d be for keeping the meat and giblets (if they are called that) as clean as possible and using it for food later.
Didn’t ISIS soldiers also eat the hearts of Syrian soldiers? May be it is the remnant throwback behavior from the old days.
Deer liver is actually quite tasty. Tastes nothing like beef or pork liver.