Oh kelpeed.
My dog was attacked by whippets.
I later found out one of the same group of dogs, unprovoked, BIT someone badly enough they needed a hospital visit.
Shall we ban them because as hunting dogs they are inheritantly vicious, dangerous animals?
You say about jacks being killing machines, could you name me a breed that isn't?
You see, for your herding breeds like your collies, gsd's etc they are exhibiting hunting behaviour. Pure, unadulterated hunting behaviour, properly bred and trained they refrain from the pull down and kill.
Terriers - bred to kill other animals, either 'vermin' or other dogs.
Gundogs - that flushing behaviour of spaniels, yep, that's modified hunting behaviour. As is running after and retrieving shot game. When pointers point - another behaviour shown when dogs are hunting down prey.
Even toy dogs and breeds bred for companionship show hunting behaviour, chasing after cats and birds, the majority of the time, you can bet that if the dog catches them they will kill them.
When they shake their toy - they're pretending to break the toy's neck.
When they pull out all the stuffing - they are replicating what they would do with caught prey I.e. Pull out all the feathers/rip up the fur to get to the meat.
When they go outside and sniff the air, that's another hunting behaviour, dogs do this when they are scenting prey.
Running after a ball - this innocent behaviour is another example of prey drive.
Dogs with no prey drive don't chase after balls.
I have been bitten by a jack Russell, I have also met MANY aggressive spaniels and some retrievers.
I have been stared down and stalked by a poodle....