Nepy, I disagree with you. I believe that Darkness is the physical manifestation of selfishness and greed. Darkness does not destroy; it takes, it hides, it manipulates, it corrupts. Darkness is not evil by itself, but its intrinsic nature is detrimental to the order and structure of society, which is why it is often perceived as evil. Darkness is much more complex than Void.
Meanwhile, this is Void:
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Sure, the metaphorical definition of Darkness fits this. But this is the natural form of Darkness. DARKNESS HAS NO PHYSICAL PRESENCE. This is the fact of it. In reality, Darkness has no form. It's not a blob, it is not a mystical gas permeating the universe, it is not in any way, a sentient being. It is blank, empty, and lacking of any characteristics aside from the labels given to it. Scientifically, the only presence it carries is its name.
Now, in metaphorical terms, I hate the idea that Darkness automatically means that you are manipulating someone, stealing, hurting, etc. I believe that between Darkness and Light, Darkness is the softer of the two. It keeps your secrets safe, and assures that if you can move with the ebb and flow, you will blend in. Light on the other hand, is the essence of revealing. All your secrets, regrets, wrongdoings, and whatnot are exposed. It may guide the way for several people, but too much of it will blind you, even hurting you.
People often see Darkness as the intruder in a world of light (true from people I have listened to in my area, not sure about other areas) and how it is the embodiment of corruption. Tell me, how can something that doesn't exist corrupt? If anything, Light is the corruption. There was once a world of absolute darkness, and then there was suddenly and element that seemed like its sole purpose was to overwhelm and conquer the Darkness, the 'native' element.