General Mattis and his words about killing people

Varifrank did a little Googling and discovered that General Mattis wasn't the only senior military man that understands the need for the occasional killing of bad guys. He discoverd several notable leaders and their words. I especially liked this one:

"War is cruelty. There's no use trying to reform it, the crueler it is the sooner it will be over." General William Tecumseh Sherman

Citizen Smash has some additional comments and links to reasons some of these bad folks deserve a good killing here.