I believe that what Humpreys thoughts are trying to covey to the reader is the concept of the man with no conscience. He looks innocent because in his mind he is. Larsen has no value system except his own desire for wealth and material gain. He does not in his own mind think he is doing anything wrong. His moral upbringing is non existent. As children our parents teach us what is right and wrong from their value system. According to Larsen he was a seed thrown onto rocky land with no soil to nurture him. He learned everything he knows on his own. Immoral means to go against the moral ways of your life. Larsen isn't doing this, he is simply living his life the way he knows how. He isn't going against his moral value system, he simply has none.
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