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Personally I've found the best yard stick to gauge alignment against is how much empathy the act involves. If you are empathetic towards someone hurting them feels bad, and you don't think you should do it. As this diminishes, more hurtful actions seem alright if they get you what you want. De-humanizing groups of people, based on arbitrary traits such as Nationality, religion, or just that they shot first, are ways of hardening yourself to the cold realities of your existence.
True paragons of goodness (Paladins, lol) do their best to minimalize this, taking steps to fight fair, and all that, but these are rare. Most people fall into varying shades of grey. Often still possessing some empathy that keeps them from doing truly terrible things.
Evil is what you call it when all that empathy is gone. When you don't care how many people you hurt to get what you want.
TL;DR:
When stop caring, they're evil.