The imperial court in Kyoto viewed warriors as thuggish and uncultured, a disdain born from centuries of security. This pacifist attitude, a luxury of their comfortable existence, left them institutionally and culturally unprepared for the raw military power of the emerging samurai clans.

The absolute divine authority of the Sapa Inca meant that capturing a single man, Atahualpa, effectively paralyzed a 12-million-person empire. With no alternative power structure, his generals were bewildered and leaderless, allowing a tiny Spanish force to maintain control.

Despite his reputation for brutality, samurai lord Taira no Kiyomori spared the young sons of his defeated rival due to family ties and underestimating their future threat. This single act of clemency allowed Minamoto no Yoritomo to survive, rally his clan, and ultimately destroy the Taira.

The powerful Minamoto and Taira samurai clans originated as a solution to an overabundance of imperial princes. Emperors removed these sons from the succession by giving them surnames and sending them to the provinces, where they formed powerful warrior clans.

Two rival samurai clans pursued divergent geopolitical strategies. The Taira focused on Western Japan, controlling the lucrative Inland Sea trade routes near the capital. The Minamoto built their power base in the undeveloped but vast eastern Kanto plain, the future site of Tokyo.

Taira no Masakado, hailed as the first samurai, was not a commoner but a member of the imperial family. His turn to provincial warfare was driven by a bitter sense of being snubbed by the central court, culminating in him declaring himself a new emperor in the east.

After executing Inca emperor Atahualpa, the Spanish installed his brother as a puppet ruler. This co-opted the existing power structure, making the conquest seem like a restoration of the natural order to local chiefs and smoothing the transition of power.

Unlike in medieval Europe, the ruling class in Japan's imperial court in Kyoto valued arts like poetry over military prowess. Warriors were seen as uncouth and vulgar. This cultural contempt for violence led the aristocracy to neglect military power, enabling the rise of the samurai.

Dara Khosrowshahi theorizes the Shah of Iran's regime collapsed because he modernized too fast, focused excessively on military power over industrial growth, and failed to bring along rural populations and integrate Islam into his vision, creating a power vacuum for the Islamic regime to exploit.