I used to do software for the defense industry. I sleep great at night. I was happy contributing to the military superiority that allows the U.S. to stay on top, and yields to us the benefits of that position.
That doesn't mean that there aren't limits to what I think is okay, but overall I think the U.S. military is still a net positive for the world, especially because of the security we provide for Europe that has enabled that continent to break its historical cycle of bloodshed and live in relative peace the last half-century. And as a practical matter--I don't think there is any other major country that would be as benevolent as the U.S. has been were it to be on top. Many have proven so (Germany, the U.K., etc).
That doesn't mean that there aren't limits to what I think is okay, but overall I think the U.S. military is still a net positive for the world, especially because of the security we provide for Europe that has enabled that continent to break its historical cycle of bloodshed and live in relative peace the last half-century. And as a practical matter--I don't think there is any other major country that would be as benevolent as the U.S. has been were it to be on top. Many have proven so (Germany, the U.K., etc).