I never said evil was good. My point was for both to exist there must be a balance. Okay, so thousands of people are starving to death. That's bad; no argument there. Doesn't that make you grateful that you are not starving? Doesn't the existence of disease make you appreciate your good health?
My point is that if nothing bad ever happened, then good would not be good, but rather expected. There would be no good. You would expect to wake up every morning and have a big meal, the sun would be shining, you'd go to work where everything would go smoothly. Everything would be just peachy all the time 24/7/365. You know all that gossip, especially about celebrities, people enjoy so much? That wouldn't exist. There would be no happy endings to books and movies, because things would end well and it would be expected because that would be all we knew. There might not even be books and movies because we wouldn't need entertainment to make us happy, and there wouldn't be anything to write about anyway. Every story has an antagonist, but if no one ever did anything bad how can there be an antagonist?
Love, creativity, beauty, passion... They uplift our spirits and bring us joy because they counteract the bad. If nothing bad ever happened we wouldn't need anything to cheer us up, so whatever makes you feel better after a bad day, forget that. Sunrises are pretty, but it would be impossible to ever see one if the sun shone all the time because there was no darkness. We could never appreciate a sunny day if it never rained.
We wouldn't need Science either. Our lives wouldn't need improving, so why bother? There would be no diseases to cure. There wouldn't be natural disasters to try and understand and predict. Necessity is the mother of invention, so if we don't need anything what reason would there be to invent?
See where I'm going with this now? There cannot be one without the other. Our world is full of opposites. Good and evil, up and down, light and dark, joy and sadness.... Without one you can't appreciate the other because that would be all you know. Everything serves a purpose. We may not understand it, but there is a reason.