Donk arguing for Franks and against Trask is like the story of the drunk looking for his car keys under the street light. A passerby stops to help and after a long, fruitless search says "I don't believe we are going to find them here." "Of course we won't find them here" the the drunk says, "I lost them down there in the middle of the block." "Well, why don't we look down there', asks the passerby. " You crazy?" says the drunk, "we probably couldn't find them there. It's dark there."
Donk knows that Franks can't find the keys, but he doesn't want to let Trask even look.