Great, now I can show you historical examples showing you are wrong in this.
The Wounded Knee Massacre (1890): U.S. Army troops slaughtered between 150 and 300 Lakota people, primarily women and children, in South Dakota. This brutal event broke the psychological resistance of the Plains Indians and effectively forced the end of the pan-tribal Ghost Dance Movement.
The Albigensian Crusade and the Massacre at Béziers (1209): Crusaders targeted the Cathars, a religious sect in southern France. When the city of Béziers was stormed, thousands of residents were killed indiscriminately. This extreme violence terified neighboring cities into immediate surrender, drastically accelerating the military campaign and the eventual eradication of Catharism.
The Massacre at Alesia (52 BCE): After defeating the Gaulish coalition led by Vercingetorix, Julius Caesar ordered the mass execution and enslavement of tens of thousands of surrendering Gauls. This mass killing eliminated Gaul's military leadership and permanently broke their capacity for organized rebellion against Roman rule.
The Western Xia / Tangut Empire (1227 CE): The Western Xia empire occupied a highly strategic trade corridor in northwestern China. After the Tanguts repeatedly broke alliances, refused to supply troops, and actively defied Mongol rule during Genghis Khan's campaigns, the Mongols viewed them as a treacherous domestic security threat. Genghis Khan ordered their total obliteration. Mongol armies systematically razed their cities, burned their extensive literature, and massacred the population. The destruction was so absolute that the Tangut language and culture were effectively lost to history until modern archaeological excavations.
The Mexica / Aztec Empire (1521 CE): While Spanish conquistador Hernán Cortés was driven heavily by greed, the ultimate, total destruction of Tenochtitlan and the Aztec ruling class was fueled by strategic survival. The highly militaristic Aztec empire possessed the sheer numbers to completely wipe out the Spanish forces and their indigenous allies if allowed to recuperate. Recognizing this constant threat, Cortés conducted a brutal, apocalyptic siege that leveled the imperial capital stone by stone, systematically dismantling the entire political, religious, and social framework of the civilization to prevent any future resurgence.
Turns out that history enforces my point. How about that?