Do we humans need pain and suffering?

Why god? Why do you create pain and sufferings? Why not just stick to happiness and pleasure? I know in science we need pain to avoid from danger. For example, we know when to avoid from hot things and we know we are sick when we are in pain. But do we need extreem pain for that? Is moderate or mild pain nt sufficient to warn us? Do we really need death of our family and friends to mould our character. From the book 'Angels and Demons', we need it to be more mature and stronger. If your child fall from his bike, you must not stop him from riding ever again.. Same concept here, we must continue to face pain to face the bleak future. Why is there war and poverty going on? Can't YOU stop it from happening. Some may say that its the doing of MEN themselves, but are you not the All Mighty?