Chapter 9: What is the reason Soda says he fights? What is the reason Steve says he fights? What is the reason Darry says he fights?

From the text:

"I don't know." He looked at me, puzzled. "It's action. It's a contest. Like a drag race or a dance or something."

"Shoot," said Steve, "I want to beat those Socs' heads in. When I get in a fight I want to stomp the other guy good. I like it, too."

"How come you like fights, Darry?" I asked, looking up at him as he stood behind me, leaning in the kitchen doorway. He gave me one of those looks that hide what he's thinking, but Soda piped up: "He likes to show off his muscles."