Not sure about that, Delos D. Harriman is a decent person, just obsessed by a single goal. He loves his wife even though he doesn't treat her very well.
I was thinking of Clark Fries, the younger brother of the main character in Podkayne Of Mars, who is a science prodigy but completely amoral. Among other antics, Clark smuggles a small, home-made atomic bomb on a spaceship that carries the two of them, along with their grandfather, to Venus from Mars.