Toward justice

I just was treated to a bad argument that I enjoyed enormously. And I don't mean "enjoyed" in the sense of belittling it, but rather that I wanted badly to agree with it, and wished that it weren't such a bad argument. I'm putting it here just so I can come back later and marvel at its damaged beauty:

Juries and judges in capital cases should be instructed that if the defendant is sentenced to death, the sentence is carried out, and the defendant is subsequently proved innocent, then the judge and the entire jury will be put on trial for murder.

Wow. Terrible reasoning, but I love it. Why oh why can't it make sense?