The existence of shit disproves the existence of God (Kundera).
Since evil is absurd, it makes no sense in a God-created world.
In the real world (and the real world does exist, whatever the level, and you can't just avoid examining its existence by explaining away one measly level through a useless God-hypothesis) however, there is both Good and Evil, both pain and pleasure, both good and bad deeds, both light and darkness.
The naive path is refusing to see the darkness. The cynical path is refusing to see the light. Both are the easy paths -- the hardest thing to accept is the coexistence of Good and Evil: on some scales it can be impossible to really grasp, in the same way that it's impossible to grasp the sheer magnitude of a world billions of people for someone programmed to live in a tribe, or grasp the size of the universe and the tininess of particles through a microscope. A field of vision has to be limited to a given scale. But not only is it the hardest thing to see, but it's also the hardest thing to accept: because it implies the very possibility of choice, and thus responsibility, morality, moral responsibility for the choices henceforth possible.
So the first hard thing is seeing and accepting the existence of both. And then, you have to understand that Evil can't win: it's absurd. Evil can't even conceptually "win" because its destruction implies self-destruction: the void (then what?).
Evil is a parasite of Good. Destruction needs creation, yet creation doesn't need destruction. Evil is weak and self-destructive. It keeps hiding behind good. But before losing, it can still do a lot of damage, and your moral responsibility is thus to help it lose, as soon as possible.
And that's the other hard thing: once you accept the existence of both, you have to know one from the other, beyond, oh way beyond, the labels and the lies.