Did I say let him get away with anything? I said give him a fine. You're going to put someone in jail for a year for killing a dog? Make him see a psychiatrist or something.
To assume that someone kills a dog, possibly the most annoying dog in the animal kingdom, means they're going to kill humans is a pretty big jump! People in eastern cultures kill/eat dogs all the time, yet they have a much lower murder rate than here!
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