This is why I like 4e's shift to "Unaligned" ... quite a number of characters (and real people) do cruel and callous things, but aren't capital-e Evil.
Truly "Evil" characters have no compunction over trampling other people to get what they want ... and they want a lot. True Evil is not just vampires and devils; Evil is also the merchant who bankrupts all his competitors by fair means or foul (assuming they don't get caught), or the Baron who treats all his serfs like animals, or the priest who kills and enslaves in the name of his god. Evil wants power over other people, or at least the power to take what it likes.
(Chaotic Evil is even worse: it has no respect for other lives, and will torture or kill on the flimsiest pretext. Chaotic Evil is the alignment of serial killers, mass murderers, and enthusiastic torturers.)
"On two occasions I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question."
- Charles Babbage (1791 - 1871)