I think its obvious were to draw the line,if you reasonably believe your life or someone elses lifes in danger you should be able to use whatever means you have to eliminate the threat.
poaching rabbits with a dog is not a threat to anyones life,maybe different if they had a gun.
Agree there should be a line.But when it comes to family and the police cant or wont do antything.Retrebution should be swift and hard.So iam told.