Under typical game-theoretic assumptions, we would assume all players to be strategic. In that context, it seems much more natural to suppose that all evil people would also be liars.
Why? Maybe some evil people are ok with kicking puppies but not with lying—that’s part of their utility function. (If such differences in utility functions can’t exist, then there’s no such thing as “good” or “evil” anyway.)
Why? Maybe some evil people are ok with kicking puppies but not with lying—that’s part of their utility function. (If such differences in utility functions can’t exist, then there’s no such thing as “good” or “evil” anyway.)