A Question of Life or Death

The "Squirrelinator"

Is it ethical to shoot a ground squirrel who eats your grapes? When you're driving down the road alongside your property and you see that same grape-eating squirrel in the road is it ethical to run him over with your car? Who decides what lives and what dies? Who decides who lives and who dies? Isn't this a question for God? By taking the life of a squirrel is there a slippery slope to a hell where giants 100 feet tall are constantly trying to stomp me?