Because doing what's wrong comes with different kinds of punishment, while doing what's right comes with rewards (even being pleased with myself is a type of reward). Theoretically thinking of them as neutral makes probability of making what's considered right and wrong more equal.
Now does somebody know a person who considers nihilism as their philosophy? I would like to hear about it.
I would at least if we're talking moral nihilism. If that every person does something for some reason then is anything truly justified as evil? When looking back we may say oh, I didn't know. Oh well had I known I would have done this. Given to any situation, we may ask all of ourselves are we bad people because we believe ourselves to be or because of what other people think?
Just as darkness is simply the absense of light, darkness is not evil. It's just a lack of light.
We want light because light shines opportunities and we can do more things than things with lack of light. The less light we have, we're limited only to animalistic basic instincts. So what's rational if you want more choices you work up to it and learn about things and how society and systems work.
Morality in my opinion is only to keep order. I think for some, it's best that people do not know about amorality because it simply doesn't need to be preached. A lack of something, is just nothing really. There are irrational people out there who are out of tune of both of their feelings and of their mind. Our feelings guide towards what's best for us, not necessarily what is for everyone.
There really is no heaven and hell, idea of religion was to control, now in today's society it's to a much lesser extent and it's more about connection than political affairs like they did in the early days of the English or Roman Catholic Church. The idea of the devil is only to make you fear. There are no such things as demons or the devil. Those who are mentally ill are caught in darkness and are stuck in a negative state of things attracting lower things and are consumed by their own thoughts. It's not easy to get out of.
I think it should be in our best interest to help everybody out where it's appropriate and possible and it's up for you to decide because death just only cancels opportunities and understanding in the grand scheme of things.
I often had the thought of these way several years ago when I was still religious that when you became or are with God, there aren't human boundaries anymore. Morality is a social construct.
Thus I do not harm others (at least not exclusively) because really it's unjustified and your better interests are at stake.
I'm fine with having laws and the justice system and am thankful that my emotions stop me from doing what's only going to limit my potential.