[dragonwriter]

> In this case a jury can exercise discretion and refuse to convict someone even when the law and evidence would demand it.

Right. Or (in the abstract, though there are pretty strong signs that its not the current intention in this case) prosecutorial discretion or executive pardon can be used before or after the point where the jury would get involved. There are numerous tools available to fine tune the justice of the application of criminal law beyond just the scope of its prohibitions, and trying to foresee all the low-probability future possibilities in crafting the statutory prohibitions gets you into nasty trap; you've got to find a balance. And, most importantly, not view criminal law (or any law) as a machine that produces justice automatically without considering the people involved in its application.