Nigel Nicholson examines 5 common reasons why leaders fail: 1) being pathological narcissists, bullies, or psychopaths; 2) being inflexible and failing to adapt to changing times; 3) overreaching and trying to bend the world to their will; 4) being lopsided in their skills without support from co-leaders or teams; and 5) being unlucky and failing to hedge against extreme circumstances outside of their control. The document analyzes each of these reasons for leadership failure and provides examples.