That sounds fairly right. MX definitely knew right from wrong, and he knew his methods were cruel but he didn't care because they were all for his plan.
Vanitas was "raised" to believe everything he was doing was right, so he only knows how to be evil. We have already been told the nature of Darkness is neither good or bad, only those who use it for malicious means make Darkness bad.
That's right, too. Say, a person who used Light powers and believed in it's philosophy trying to cover the whole world in Light, knowing that it cannot exist at all without Darkness to sustain it. To act as it's equal....To balance it. If Darkness is neither good or bad, then we must assume the same of the Light.
As far as personality goes, it's all psychology...the mind. Vanitas was most certainly condition to be Dark just as Ventus was conditioned by Eraqus to fight for the Light. It's all about conditioning. And through that conditioning, is where mindsets, ideas, and points of view can take form.
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