Once upon a time there was a thoroughly mediocre man. He was incapable of finishing secondary or vocational school. By age 22, he found some small success as a salesman. He lived with his parents when not on the road making sales calls. Eventually he lost interest in the job, his performance dropped, and he was fired.
On the advice of his father’s friend he joined a political party. He didn’t join out of any sense of conviction. He didn’t even know the party’s platform. He just wanted the sense of being part of something - of belonging. When the party came into power he saw it as his best chance at some sort of success.
By his own admission he did best when he was told what to do. Projects he initiated failed. He did not have the capacity to think about what he was doing with any depth. His inability to speak coherently reflected his inability to think. He would obliviously string together contradictory ideas within a single statement. He was literally a thoughtless man.
But he could carry out the tasks he was given as long as he operated within an established framework. He did not excel at his job in the same way a cog in a machine does not excel at being a cog. It simply performs as a cog should. He eventually rose to a low level management position and there he would stay for the rest of his career.
He worked primarily in transportation planning. In time he became adept at moving people from one place to another in the most efficient manner. To him the destination was irrelevant. Initially he was working on the forced emigration of Jews out of Germany. But within a few years, on orders from his superiors, the process was adjusted to transport Jews to death camps. And that is how Adolf Eichmann became The Man In the Glass Booth on trial for his life in Jerusalem in April 1961.