Most Nolan male characters are obsessive & delusional.The male protagonists in MEMENTO, INSOMNIA, PRESTIGE, DARK KNIGHT & INCEPTION are obsessed with control, revenge, justice, self-righteousness. And you can say they are all tunnel-vision fanatics.
Lenny in MEMENTO only trusts "facts." The way he numbers the "facts" (which really only "factual" to Lenny) like commandments make the character look like a religious fanatics: "Must find killer of dead wife now!"
Bruce Wayne in DARK KNIGHT is obsessed with complete eradication of the ills of society, what Joker refers to as "misplaced sense of self-righteousness." With his cape and grim determination, he looks like a fanatic Middle Age crusader out to drive off infidels from his clean city.
Angier in PRESTIGE is obsessed with revenge & winning over his "nemesis" with increasingly spectacular showmanship even if it means sacrificing his own body/ies & soul. SPOILER : his obsession with the drowning of his wife is replicated/re-experienced in the drowning of his clones. Talk about being drowned in constant sorrow.
Cobb in INCEPTION is seemingly a good guy who only tries to get over death of his wife & go back to his children. Or is he? Maybe in some psychotic rage he is the one who kills his own wife and that's why he is an exile during most of the movie? Maybe he actually lost the custody battle of his children to his wife's family. Maybe the whole movie is just his own self-inception that he could go back to his family & earn the trust of his children?
All tunnel-vision fanatics.