JERRY: Well, it's all just part of this - they don't know I need it, see. Okay, so there's that. And even if they did, I wouldn't get it. So there's that on top, then. See, these're personal matters.
CARL: Personal matters.
JERRY: Yah. Personal matters that needn't, uh –
CARL: Okay, Jerry. You're tasking us to perform this mission, but you, you won't, uh, you won't—aw, f*** it, let's take a look at that Ciera.
Carl's greed makes him overlook Jerry's secrecy about his motivations for the kidnapping. If he would've pushed, he might have seen that Jerry was a pretty desperate and pathetic guy who hasn't thought this through at all; he could have backed out of the scheme. But he wants the car.