Why would the Spanish want to make friends with the Comanche?

Answer 1

Pacifying native Amerindian Tribes, especially violent ones like the Comanche, was critical to securing Spanish control of the Americas and extracting resources. The Comanche in particular were able to penetrate deep within Spanish Mexico and disrupt not only border operations, but central territories and key areas of governance. Creating a peaceful situation was necessary to restore the proper functioning of the Spanish colonial authorities.

Additionally, if violent tribes like the Comanche, could be made into allies of the Spaniards, they could be an effective border-protection force. Unfortunately, the Spaniards had no success in taming the Comanche. The only end to the conflict between the Comanche and the Spaniards was when Mexico became independent and subsequently lost control of the Comanche territory with the US Annexation of Texas and the Mexican-American War. The Comanches were later almost completely exterminated by the US Military in the late 1800s, effectively ending hostilities.