What decision did montezuma II make that hurt his people?

Montezuma II made the decision to welcome Hernán Cortés and his Spanish conquistadors, believing they were divine figures or messengers. This decision led to a significant underestimation of the threat posed by the Spaniards, ultimately resulting in the conquest of the Aztec Empire. His hospitality and subsequent actions alienated many within his own empire, contributing to internal dissent and the downfall of his people.