Much interesting and valuable history and psychology in this essay by Freddie deBoer, despite some weak connections between different ideas, and an unfairly harsh reference to "the desperate progressive desire to find a good war, to support a good war."
A few key nuggets:
Our political debates engender a habit of mistaking the simple moral impermissibility of great crimes for simplicity in the events that lead to them. This is always and only a mistake.
...good will is no guarantee of good deeds,
...war is unpredictable and intervention fickle,
...overwhelming military superiority is essentially worthless when it comes to securing peace.