"Except for an extraordinary diligence in looking out for his personal advancement," wrote Arendt, "he had no motives at all. And this diligence in itself was in no way criminal; he certainly would never have murdered his superior in order to inherit his post. He merely, to put the matter colloquially, never realized what he was doing." She concludes that, although Eichmann was no puppet, he was immensely – and catastrophically – thoughtless.
In a nutshell, she was unable to grasp the truth that sin - not thoughtlessness - was the seed from which Eichmann's actions sprouted along with the horrifying truth that same sin is also present in everyone else with the potential for similar (and even worse) acts.
Naïve idealism is epidemic among our culture's young people. This worldview is characterized by beliefs and thinking that is overly optimistic but not realistic or well thought out. This type of thinking is typical of adolescents and young adults. Individuals who think this way believe that things will work out exactly as desired without actually thinking the plan through with attendant consequences. An example would be a person who believes that their life would be perfect and without worry if they lived somewhere else, like the beach. They aren't thinking about real life consequences and situations, only the idealized version in their mind.
Failing to recognize the fundamental truth of original sin, it's a breeding ground for trouble. Contrary to the Biblical truth of sin (i.e. Rom 3:23), naïve idealism believes that everyone is ultimately good. Instead of accepting the truth that all problems in this world ultimately spring forth from within man, it externalizes them. The solution must thus to be found in the environment - education, medical care, jobs, money, entertainment, drugs, alcohol, fame, power, etc., etc.
In this faulty worldview, noble intentions always win out. There is no acknowledgement of the pervasive effects of sin across creation. For all practical purposes, the Second Law of Thermodynamics does not exist from the perspective of naïve idealism.
But original sin is a critical part of the gospel, the very reason that Christ came to die. Lose the concept of sin and the gospel goes out the window. The inability to recognize and acknowledge sin undergirds this fatal worldview that is unfortunately increasingly popular in the culture.