Justice for Some. It depends, though.

This story shocked me not because of the murder of two white men by a "half-breed," but because I think any rapist deserves death. The author did not act shocked, nor did anyone involved in the story seem to feel for a moment merciful for the young man who was defending his mother and sister's honor. If your mother and sister were raped and left for dead, you can't honestly tell me you wouldn't shoot to kill when you met the perpetrators.

“…On October 27, 1870—John Boyer bid two local Six Mile customers farewell with a seven-dollar revolver. He fired one lead slug into William H. Lowry’s left breast and put a second round into the gut of James McClusky.
The trouble started when young John Boyer came home and found his widowed Sioux mother and sister tied and gagged. They had been raped by the two men, who were known to hang around Fort Fetterman. The next night, October 30, Boyer encountered the rapists at a dance that was held at the Six Mile ranch. He was unarmed, however, because the bartender had taken each patron’s weapons for safekeeping as he entered the hall.
Waiting until about 2 am, Boyer retrieved his pistols from the barkeep and left the building. Soon after, he mounted his horse and rode back to the entry where he called for McClusky and Lowry. He called them out saying, ‘he could whip them.’ As they appeared at the door, the twenty-six-year-old pulled his revolver and ‘deliberately, and without a moment’s warning, shot and killed them both.’ Boyer immediately fled—undeterred—and hid with a band of local Sioux. However, the Indians, fearing reprisals, turned him over to the authorities when they demanded his return.
While waiting for the First District Court, which had convened to decide his fate, Boyer threated to foil the noose when he escaped on or about March 30, 1871, from he Fort D.A. Russell guard house where he was kept pending his execution. The three-hundred-dollar reward that was offered for his capture was claimed several days later as he was arrested enroute back to Fort Laramie.
‘He was met on the road walking alone with his handcuffs off and fastened to his belt,’ witnesses reported. ‘Seeing the coach coming, he left the road and while the stage was passing a curve in the road, hiding him from view, he secreted himself under the bank of a ravine and was only discovered and recognized as the stage had passed his place of concealment.’ Fort Laramie officials quickly sent a ‘Captain Wilson’ and a detachment of Fifth Cavalry soldiers, who raced to the spot armed and ready. Boyer would not refuse the captain’s ‘invitation’ to join them for a trip back to Cheyenne. Authorities put him on the next stage to Cheyenne, where he arrived the next evening, April 2… The Evening Leader reported he went to meet his Maker on April 21, 1871, in an ‘old grout building, nearly in front of the jail,’ in Cheyenne with these words on his lips: ‘Look at me! I no cry, I no woman; I man. I die brave!’
Boyer had the ‘distinction’ of being the first of only seven persons to be legally hanged in the Wyoming Territory.”

(From The Hog Ranches of Wyoming, by Larry K. Brown)