It’s not often that I simply post an article but this essay by Andrew J. Bacevich, which originally appeared on TomDispatch, is worth reading.
Only when Americans openly acknowledge their imperial transgressions will genuine repentance become possible. And only with repentance will avoiding further occasions to sin become a habit. In other words, only when Americans call imperialism by its name will vows of “never again” deserve to be taken seriously.
Shalom (שלום), MAA
An International Educator in Viet Nam 
Here’s a related essay by Tom Engelhardt:
Slaughter Central
The United States as a Mass-Killing Machine
By the time you read this piece, it will already be out of date. The reason’s simple enough. No matter what mayhem I describe, with so much all-American weaponry in this world of ours, there’s no way to keep up. Often, despite the headlines that go with mass killings here, there’s almost no way even to know.
On this planet of ours, America is the emperor of weaponry, even if in ways we normally tend not to put together. There’s really no question about it. The all-American powers-that-be and the arms makers that go with them dream up, produce, and sell weaponry, domestically and internationally, in an unmatched fashion. You’ll undoubtedly be shocked, shocked to learn that the top five arms makers on the planet — Lockheed Martin, Boeing, Northrop Grumman, Raytheon, and General Dynamics — are all located in the United States.
https://tomdispatch.com/slaughter-central/