My objection lies in the presumption that winning battles or conquering enemy cities causes WW. By that logic the Mongols would've been suffused with grief before taking half of China, the French would've been totally demoralized before Napoleon took Vienna, and Nazi Germany would've been nearly prostrate from lost production due to war-weary citizens "on strike" after gobbling up western Poland, the Low Countries, and France.
Of course winning battles and conquering territory entails loss of life, but so what? The Romans, Mongols, French, etc. weren't SNAGs (Sensitive New-Age Guys), they were remorseless killers who believed that they were superior to anyone else. From an early age they experienced the loss of siblings and playmates from accident, deprivation, disease, or war so mortality was ever-present and stoically accepted. Their cultural mythologies glorified war and individual sacrifice. Postmodern pacifists can't seem to grasp this, which makes it difficult for them to understand history or face the nature of present-day jihadis.
And that's my opinion. Have a nice day and happy gaming!