[...] even in today's fairly "peaceful" era post WW2 [...]
There is no such thing as “fairly 'peaceful' era post WW2” even with quotation marks for peaceful.
“U.S. military forces were directly responsible for about 10 to 15 million deaths during the Korean and Vietnam Wars and the two Iraq Wars. The Korean War also includes Chinese deaths while the Vietnam War also includes fatalities in Cambodia and Laos.”
“In 1995 the Food and Agriculture Organization of the U.N. reported that U.N sanctions against on Iraq had been responsible for the deaths of more than 560,000 children since 1990.”
“The American public probably is not aware of these numbers and knows even less about the proxy wars for which the United States is also responsible. In the latter wars there were between nine and 14 million deaths in Afghanistan, Angola, Democratic Republic of the Congo, East Timor, Guatemala, Indonesia, Pakistan and Sudan.”
“But the victims are not just from big nations or one part of the world. The remaining deaths were in smaller ones which constitute over half the total number of nations. Virtually all parts of the world have been the target of U.S. intervention.”
“The overall conclusion reached is that the United States most likely has been responsible since WWII for the deaths of between 20 and 30 million people in wars and conflicts scattered over the world.”
“And the pain and anger is spread even further. Some authorities estimate that there are as many as 10 wounded for each person who dies in wars. Their visible, continued suffering is a continuing reminder to their fellow countrymen.”
http://www.countercurrents.org/lucas240407.htmthe world has not been able to come together and ensure no sovereignty or country is forcefully taken over by another.
So true. Even after WWII so many sovereign countries have been or remain forcefully taken over and occupied by US, such as Hawaii (since 1896), Cuba (Guantanamo), Iraq, Afghanistan, Germany (37,704 troops), Japan (48,828 troops), South Korea (27,558 troops), Kuwait (12,485 troops), and the list goes on almost endlessly, with a an official total of 173,335 troops occupying more than 150 countries worldwide, not counting hundreds of thousands of mercenaries and proxy combatants such those from the Islamic State (which US charitably calls “Free Syrian Army”), al-Nusra Front, and other US supported terrorist groups worldwide.
https://en.wikipedia.org/wiki/United_States_military_deployments