[hazardmat]

I'm making a prediction on what's likely to happen based on well-researched human psychology. Again, the keyword is "cognitive dissonance". It encompasses all aspects of human life, the petty theft is just an example.

The moral dimension to this is entirely besides the point, the fact that you even bring it up tells me you are probably "suffering" from what is called a "Moralistic Fallacy".

I'm not making a moral argument or judgment here, but there's certainly the related question of whether someone who believes their own lies is truly a liar.