Wells and Coyne on torture

A good debate between Andrew Coyne and Paul Wells on the torture issue in the US. Wells hits it out of the park in this debate compared to Coyne's weak, mumbling defense.

Proponents of torture always use the ticking time bomb analogy to justify why it should be legal. If that's really the rationale for why torture should be allowed and if that really describes the rare occasion when its use would be acceptable, then isn't its illegality (with extreme penalties for its use) exactly the right deterrent necessary to prevent its regular use by authorities?