The jury didn't really share any of the emotions people are projecting onto them. As was their job--and their constitutional duty--they simply deliberated based on the FACTS of the case.
From the AP article:
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The jury rejected two key defense arguments -- that Moussaoui suffers a mental illness and that executing him would make him a martyr. No jurors indicated on the verdict form that they gave any weight to those arguments.
Nine jurors found that Moussaoui suffered a difficult childhood in a dysfunctional family where he spent many of his early years in and out of orphanages. Three found that Moussaoui only played a minor role in 9/11.
Defense lawyer Gerald Zerkin said outside court that "it was obvious that they thought his role in 9/11 was not very great and that played a significant role in their decision."
Prosecutors, who pursued the Moussaoui case for 4 1/2 years, declared themselves satisfied with the jury's verdict.
Deputy Attorney General Paul McNulty, who was chief prosecutor in Alexandria in December 2001 when Moussaoui first was charged, noted that the jury in the trial's first phase found Moussaoui responsible for the 9/11 attacks by concealing the al-Qaida plot from FBI agents after he was arrested in August 2001 on immigration violations.
"It only takes one juror to reject imposition of the death penalty, and we respect that," McNulty said.
Moussaoui: U.S. Will Never Catch Bin Laden