You know, there's just something about people saying stuff like, "killing defenseless animals is wrong and primitive" that completely baffles me.
Do you ever clean with bleach? Do you ever use mouthwash? Have you ever swatted a fly?
Where do you draw the line at what is a pest and what is not? Bacteria and germs are living things, and yet we all kill MILLIONS of them daily with bleach and denatured alcohol. A fly (in your context of meanings) has just as much reason to life as we do, but we think nothing of spraying them with Raid.
"But they sread disease" will be your argument, right? And? Where does something that is a pest/nuisance cross the line into being more important than our own safety/wellbeing/comfort? Where is the magical line that differentiates between something that is a viable target for extermination and something that should be left to its destructive nature and ruin our lives/homes?
In my opinion, that magical line appears a smidgeoun below the human race. Anything and everything else becomes a valid target for extermination when it crosses the boundaries into becoming a pest/nuisance. If it leaves me alone, I'll leave it alone. It starts tearing up my property or affecting my life adversely, it will be dealt with.
If you have an infestation of rats or mice in your house, what do you do? You either set out traps or call an exterminator. Either way, you are killing multiple "defenseless creatures". Maybe not with your own hand, but you are instigating the whole process. So what's the difference between said mice and foxes that are ravaging your source of eggs and poultry? NONE!! So at that point foxes are at the same point on the "target chain" as mice are in your cupboard. Just a different weapon of extermination is used, that's all.