IMO, there's a HUGE difference between "fighting" and tearing apart a dog.
My four can get into HORRIFIC fights - usually over food - but even though it's loud and sounds like they are killing each other, in the 10 years I've had my oldest two, none has EVER HAD ONE SINGLE INJURY. It's almost like a rough play. They've also never attacked a stranger's dog. I guess it's like when I used to beat up my little brother
The dogs that attacked Cayman seemed out for blood, not just having a disagreement. Big difference, IMO.