The taste for blood is truly a very old wives tale, or maybe a mens tale, who knows.
Feeding "raw" has been around for years, except it used to be called "feeding themselves" How many family dogs on farms ate butchered cow that was left over, ate bones/intestines from butchering? Lots and lots. Killed and ate rabbits/mice/chickens/etc, then went and played in the pond or fields with the kids?
However, Harley chased, caught and killed a little dog. Without proper control and being very careful, if he sees another little yapping charging dog running towards him or away from him, he most likely will want to chase and do the same thing. The harness was great when he was walking calmly beside you, but you had as much chance as stopping him with a harness as stopping a charging horse with a piece of twine around its neck.. I think harnesses are great for certain situations, but you lose control very quickly. I would not take Harley outside without a muzzle and a prong collar. Show the neighbors you are trying to prevent another accident. Harley may never be forgiven by the neighbors, but the more "active" you can be with control, the more folks might eventually forget.