I was thinking that as well but mainly because you are free of constraints. Doing what ever you feel like isn't evil it's chaotic (I think Hex has said as much in a different thread). It just so happens that once you remove the constraint of killing villagers you can go evil fairly quickly. If you were Pure Evil it would be very challenging indeed Imagine try to play the game without killing any unnecessary evil creatures. I say unnecessary because you have to kill some evil creatures for the main quest to progress, which shows you that the game leans toward good by nature.
Anyone up to trying that? Do no good deeds intentionally.
That's exactly Right and killing villagers doesn't make you scary. Getting Caught does. I've killed most of Oakvale by getting one person at a time to follow me to a secluded area and quickly drawing my sword striking and re-sheathing. No one cared unless I got caught. So watch that eye in the corner of the screen.