"What's he got against Lennie?"
The swamper considered.... "Well... tell you what. Curley's like a lot of little guys. He hates big guys. He's alla time picking scraps with big guys. Kind of like he's mad at 'em because he ain't a big guy. You seen little guys like that, ain't you? Always scrappy?"
"Sure," said George. "I seen plenty tough little guys. But this Curley better not make no mistakes about Lennie. Lennie ain't handy, but this Curley punk is gonna get hurt if he messes around with Lennie."
Which major theme is developed in the above excerpt from Chapter 2?