"Measuring purely by confirmed kills, the worst mass murderer ever executed by the United States was the white supremacist terrorist Timothy McVeigh. On April 19, 1995, McVeigh detonated a massive bomb […] killing 168 people, including 19 children. […] McVeigh, who in his own psychotic way thought he was saving America, never remotely killed on the scale of Kissinger, the most revered American grand strategist of the second half of the 20th century."
https://www.rollingstone.com/politics/politics-news/henry-kissinger-war-criminal-dead-1234804748/