Ksatriya means who gives protection the citizens from being hurt by the irreligious person. That is called ksatriya. Ksat. Ksat means injury, and tra means deliver. Just like Maharaja Pariksit. When he saw that a black man Kali was going to kill a cow, so he was going to inflict injury to the cow, and immediately Maharaja Pariksit took his sword, that to give protection to the cow from the injury of black man. So that violence required. Tit for tat. One who is going to commit violence unnecessarily, the king, government, should immediately take the sword and kill that person. That is government's duty. Had it been Vedic culture prevailing now, all these persons who are unnecessarily killing the cows in the slaughterhouse, they would have been killed by the king. "You have done so sinful." So that kind of killing is pious. To give protection innocent citizen or animals from being injured by the rascals, the government or the king should take his sword and kill immediately. This kind of killing is there in the Bhagavad gita. Not that general killing. You can capriciously kill anyone and give the evidence, "Oh, it is Bhagavad-gita. It is there." How… See how rascals, they are interpreting. Therefore we are presenting Bhagavad-gita as it is, without interpreting in a rascal's way.
>>> Ref. VedaBase => Bhagavad-gita 2.36-37 — London, September 4, 1973