Good and Evil tend to be subjective terms that mostly depend on the point of view.
Snapping half of sentient beings out of existence may seem a very evil thing, but is it actually if such beings are already living in misery without help and such act is the only way to teach population control and resources management (thing that, unlike doubling the resources, you can also do without some almighty gems of infinite power)?

Instead, I subdivided the Alignment system into Chaos, Order, Creation and Destruction, which should be kinda more objective concepts. You can presume that creatures affine to Order or Creation are closer to good and those affine to Chaos or Destruction are closer to evil, but it's not a rule and it shouldn't be.