If evil doesn't exist, why does anyone ever complain about anything?

And why is it that most of the "unpleasant" things are almost always considered "evil" by those of us living under the good/evil delusion?
Update: All right British Shorthair...if you get pneumonia from being rained on, then give me money to supply you with antibiotics in order to cure your pneumonia, and then I don't give you the antibiotics you paid for, do you have a right to complain?
Update 2: Alrighty...but why wouldn't you like it? There's nothing wrong with it.

Are our laws and morals completely arbitrary?

(i.e. I am not equating complaints being the establishing force of evil.)
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