When I lie I must think about the other guy, the person I am trying to deceive, in one of two ways:
(1) he is an aggressor and I must lie to defend myself, (2) he is a good person but I'm doing him an important favour.
Thus for example: (1) I deceive during wartime by feeding false information to enemy spies or painting wooden boxes to look like tanks, (2) I lie to a family member in order to protect his feelings.
These are 'good' lies. How does it manifest with bad lies?
I conjecture that the bad guys think in precisely the same ways!
So, for example, Hitler really thinks he is is the victim and needs more breathing room, (2) the conman believes his mark is naive and will benefit from learning the ways of the world.
In order to accomplish this the liar has to be intellectually dishonest. He must adopt conspiracy theories or other crazy explanations. He must ignore the nagging feeling from his conscience or impute it to the enemy's supposed injustices.
This makes me doubt the existence of bad intentions. Or if they do exist, they are strictly unconscious. Everyone sees himself as a good guy or a victim.