First off, one must get to the roots of what we consider good and evil and get past them. Instead of good and evil, right and wrong, think of accurate and inaccurate as the logical poles by which a judgment can be rendered. There are accurate and inaccurate views of the world. The criterion upon which these views are based lies in evidence , or the lack thereof. This is because, as thinking, rational beings, the only thing we have to work with is what we can access via evidence.
Evidence is the building block of logic, and thus, reason.
Something is accurate when there is enough evidence to support it. Water is wet. This is an accurate statement. Water is dry. This is an inaccuracy.