Background: Christopher Houston Carson (December 24, 1809 - May 23, 1868), better known as Kit Carson, was an American frontiersman. He was a mountain man (fur trapper), wilderness guide, Indian agent, and U.S. Army officer. Carson became a frontier legend in his own lifetime via biographies and news articles. Exaggerated versions of his exploits were the subject of dime novels.
Context: In August 1826, against his mother's wishes, Kit ran away from his apprenticeship. He went west with a caravan of fur trappers, tending their livestock. They made their trek over the Santa Fe Trail to Santa Fe, the capital of Santa Fe de Nuevo Mexico, reaching their destination in November 1826. Kit settled in Taos.  Carson lived with Mathew Kinkead, a trapper and explorer who had served with Carson's older brothers during the War of 1812. Carson was mentored by Kinkead in learning the skills of a trapper, while learning the necessary languages for trade. Eventually he became fluent in Spanish and several Indian languages.  Workman put an advertisement in a local newspaper back in Missouri. He wrote that he would give a one cent reward to anyone who brought the boy back to Franklin. No one claimed the reward. It was a bit of a joke, but Carson was free. The advertisement featured the first printed description of Carson: "Christopher Carson, a boy about 16 years old, small of his age, but thick set; light hair, ran away from the subscriber, living in Franklin, Howard county, Missouri, to whom he had been bound to learn the saddler's trade."  Between 1827 and 1829, Carson worked as cook, translator, and wagon driver in the southwest. He also worked at a copper mine near the Gila River in southwestern New Mexico. In later life, Carson never mentioned any women from his youth. There are only three specific women mentioned in his writing: Josefa Jaramillo, his third and last wife; a comrade's mother in Washington, DC; and Mrs. Ann White, a victim of Indian atrocities.  In 1845, Carson guided Fremont on their third and last expedition. They went to California and Oregon. Fremont made scientific plans, but the expedition appeared to be political in nature. Fremont may have been working under secret government orders. President Polk wanted the province of Alta California for the United States. Once in California, Fremont started to rouse the American settlers into a patriotic fever. The Mexican government ordered him to leave. Fremont went north to Oregon, though not before instigating the Sacramento River massacre, in which at least 150 Indians were killed in an unprovoked attack. The party moved up along the Sacramento River, continuing to kill Indians as they went, then camped near Klamath Lake. Messages from Washington, DC made it clear that President Polk wanted California.  At Klamath Lake in southern Oregon, Fremont's party was hit in a revenge attack by 15-20 Indians on the night of May 9, 1846. Two or three men in camp were killed. The attackers fled after a brief struggle. Carson was angry that his friends had been killed. He took an axe and avenged the death of his friends by chopping away at a dead Indian's face. Fremont wrote, "He knocked his head to pieces."  In retaliation for the attack, a few days later Fremont's party massacred a village of Klamath people along the Williamson River in the Klamath Lake massacre. The entire village was razed and at least 14 men, women and children were killed. There was no evidence that the village in question had anything to do with the previous attack.  Carleton had chosen a bleak site on the Pecos River for his reservation. This reservation was called Bosque Redondo (Round Grove). He chose this site for the Apaches and Navajos because it was far from white settlements. He also wanted these Apaches and Navajo to act as a buffer for any aggressive acts committed upon the white settlements from Kiowas and Comanches to the east of Bosque Redondo. He thought as well that the remoteness and desolation of the reservation would discourage white settlement.  The Mescalero Apaches walked 130 miles (210 km) to the reservation. By March 1863, four hundred Apaches had settled around nearby Fort Sumner. Others had fled west to join fugitive bands of Apaches. By middle summer, many of these people were planting crops and doing other farm work.  On July 7, Carson, with little heart for the Navajo roundup, started the campaign against the tribe. His orders were almost the same as those for the Apache roundup: he was to shoot all males on sight, and take the women and children captives. No peace treaties were to be made until all the Navajo were on the reservation.  Carson searched far and wide for the Navajo. He found their homes, fields, animals, and orchards, but the Navajo were experts at disappearing quickly and hiding in their vast lands. The roundup proved frustrating for Carson. He was in his 50s, tired, and ill. By autumn 1863, Carson started to burn the Navajo homes and fields, and remove their animals from the area. The Navajo would starve if this destruction continued. One hundred eighty-eight Navajo surrendered. They were sent to Bosque Redondo. Life at the Bosque had turned grim. Murders occurred. The Apaches and Navajos fought. The water in the Pecos contained minerals that gave people cramps and stomach aches. Residents had to walk 12 miles (19 km) to find firewood.
Question: Why did Carson campaign against the Navajo?

Answer:
At Klamath Lake in southern Oregon, Fremont's party was hit in a revenge attack by 15-20 Indians