This story summarizes an investigation into why 14 soldiers from one army base in Colorado have been convicted of or charged with 11 murders and two attempted murders over a three-year period. Almost all were Iraq veterans, and several claim to have witnessed war crimes. A number had pre-existing psychological problems that normally would have kept them out of the service.
This kind of thing is in all likelihood the tip of the iceberg. It’s hard to ignore dead bodies, at least if they’re those of American civilians, but one can well imagine the amount of domestic abuse, reported and especially unreported, that represents just some of the collateral damage of war.