>>20458936Evil needs to exist due to logic and reason.
You can't differentiate something without having its opposite, in order to know what good is, you must first know what good is not.
Good is only good within the context of evil.
Imagine a world of only good, where you can only feel happiness, this would be a hell where you feel completely numb.
The sine wave perfectly encapsulates the pattern of existence, in a world of only good or only evil it would just be a static flat line.