They have to be kidding to even pretend to give it consideration. Keep him here and hear him sing. We have made dirtier deals with far bigger douchebags. For instance, the Mulroney government gave hitman (estimated 15 kills) Real Simard a fabulous gym/cell and a shortened sentence in return for testifying against Montreal mobster Vic Cotroni, who then conveniently pegged out. Here we have a guy who did the same kind of bribery/fraud/income tax evasion on both sides of the Atlantic in our power. Yes, they want him in Germany, but we want him here, and the difference between us and the Germans is we have the bastard on ice. So let's make a deal. If KarlHeinz has the goods: the story, the paperwork, hopefully some tape, let's wind him up and let him run around the room. If it's all just a big crock, we'll send him back to Germany and let them take their shot. If he goes back now, we'll never know whether the allegations against Mulroney are true. That will leave a cloud over Mulroney, Elmer MacKay, Marc Lalonde, Fred Doucet, Frank Moores, Stevie Cameron, the CBC and Harper's government. Removing that cloud altogether or separating the innocent sheep from the avaricious goats is worth the price of keeping KarlHeinz here and making him happy enough to chat.
As for the allegations against Chretien, all the more reason to have a special prosecutor. If Chretien is innocent, the cloud over him should be removed. If not, he should be punished. Same as for you, me, the guy around the corner, or any other Canadian.