Kennedy, Johnson and McNamara were private realists but chose the path of least resistance, writes Fredrik Logevall https://www.economist.com/by-invitation/2026/05/05/the-architects-of-the-vietnam-war-knew-it-was-doomed?taid=69fa1084083ff20001076e40&utm_campaign=trueanthem&utm_medium=social&utm_source=voante