Some may even regret that they had to harm others.
Now this is something I just can't even conceive of, unless they are sorry because they fell away from some benefit by causing harm.
The stereotypical benefit would be that the people would have been more useful alive, but many evil people do care for others. Sometimes this care is what drives them to "evil" acts.
Originally Posted by FelLich
Good and evil are completely subjective. Villains don't see themselves as the bad guy, they see themselves as the only one that's right. After all even things like Genocide and Ethnic Cleansing are actual and constant events and I doubt the people committing them think themselves evil, merely that they're making the hard choice. You can argue whether a sociopath or extreme narcissist can be considered inherently evil and not everyone would agree or disagree. Same goes for the nature of good, just because a billionaire donates to a charity doesn't make them good it can also be viewed simply as their method of buying their way into a good afterlife. After all how did that billionaire even earn their money, how many lives did they ruin on their way to such wealth and how much harm did they cause in the long term. You can even argue the motives behind good actions, the guy who helps out at a local shelter is doing something good, but can be doing it simply because it makes them feel good. They're doing a good action but for a completely selfish reason. Good and evil, justice and revenge are concepts created and enforced by the community not natural concepts instilled in every human being.
You said this much better than I could.
It is probably hard for game developers to create a proper evil path because of this. Many people want a clear definition of which path is which, often because they want to feel the positive emotions that they get from doing the "right" thing. Others are used to the old ways of writing where good and evil are obvious and good always wins, they do not like the idea of sometimes evil being right and good being wrong.. There are also many people who prefer a more realistic version of things where good and evil all have shades of grey and the decisions are harder to make. Impossible to please everyone. If you throw the option of evil in a game just to placate those who wish to play it, then it ends up feeling shallow. If the option is not there at all then it makes the game feel unrealistic and to many of us, boring and frustrating. Well done evil options give much more depth to a game and there is good potential for it to be in this one.