The Bandit wars helped to bring more recognition to the Texas Ranger.
A State has always had the authority to defend invasion. But, most .gov care not about the lives of their citizens.
One of the things that brought about the formation of the Rangers was the constant threat from the Comanches. In the beginning, the Rangers were getting thumped. They decided that if they were going to have a chance at fighting the Comanches, they had to train like them. That, plus the introduction of the six shot revolver, began to work. Then the Civil War came, and the Rangers were not available to fight the Comanches. After the Civil War, the United States Army took up the task and the Comanches were defeated.
If a man was Ranger tough, he was Comanche tough. Definitely NOT a man to mess with!