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Slim sighed. "Well, I guess we got to get him…" (5.93)
Crushing a man's hand under extreme provocation is one thing; killing a woman is another. Even Slim admits that Lennie has to be brought to some sort of justice—but not the justice that Curley wants, because that's no justice at all.
Slim nodded. "We might," he said. "If we could keep Curley in, we might, But Curley's gonna want to shoot 'im. Curley's still mad about his hand. An' s'pose they lock him up an' strap him down and put him in a cage. That ain't no good, George." (5.97)
Being locked up in a cage is no good for Lennie, but aren't all the farm hands trapped in some way? They might not be in cages, but they're stuck all the same. (Still, we're pretty sure that Steinbeck isn't suggesting that we euthanize all itinerant workers.)
And when they were gone, Candy squatted down in the hay and watched the face of Curley's wife. "Poor bastard," he said softly. (5.112)
Not "poor girl," but "poor bastard." We get the feeling that Candy knows who the real victim is here: not Curley's wife, who he thinks brought it on herself, but poor, dumb, innocent Lennie.