Why are George and Lennie different from the other "guys like us that work on ranch"?

From the text:

"Guys like us, that work on ranches, are the loneliest guys in the world. They got no fambly. They don't belong no place. They come to a ranch an' work up a stake and then they go into town and blow their stake, and the first thing you know they're poundin' their tail on some other ranch. They ain't got nothing to look ahead to."

Lennie was delighted. "That's it- that's it. Now tell how it is with us."

George went on. "With us it ain't like that. We got a future. We got somebody to talk to that gives a damn about us. We don't have to sit in no bar room blowin' in our jack jus' because we got no place else to go. If them other guys gets in jail they can rot for all anybody gives a damn. But not us." Lennie broke in. "But not us! An' why? Because... because I got you to look after me, and you got me to look after you, and that's why." He laughed delightedly. "Go on now, George!"