Pierre engaging in such actions is known as rationalizing.
When a person rationalizes a decision they:
Pierre is clearly doing something wrong here by increasing expenses more than they are supposed to be. He however convinces himself that what he is doing is not bad because no one will notice.
He is therefore coming up with reasons to prove that what he is doing is not bad and we can conclude based on this fact that he is engaged in rationalizing his behavior.
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