Most resource guarding is fixable. To me, saying you don't want to live with a resource guarder is almost like saying you don't want to live with a dog that isn't house broken... It's fixable, so why get rid of the dog just because you don't want to put in the time to fix the issue? (Granted that a dog not being house broken doesn't involve biting.) Also, I see a HUGE difference between resource guarding and flat out human aggression.
"I never saw a wild thing sorry for itself." -D.H. Lawrence
"Only when the last tree is cut, only when the last river is polluted, only when the last fish is caught, will they realize that you can’t eat money." –Native American proverb