Donut----"Without evil, could there be good?"

YES! Good can exist without evil. I don't see both as counterbalancing each other eg. yin/yang, light/dark.

I see evil as a distorted version of Good. A paler version of the original. A copy. Example, if we're hungry we can buy a donut to fill us up, that's good. However, if we eat 6 donuts because they're free, that's evil. Glutonny is the twisted version of Hunger.