This does not come from my desire for the satisfaction of moral vengeance. It comes from my belief in the centrality of law to creating the possibility of moral order. There is a well-known statement in Pirkei Avot (in the Mishnah) that powerfully describes the importance of legal order:
Rabbi Chanina S'gan Ha-Kohanim said 'Pray for the well-being of the government - because without fear of it, a person would eat his neighbor alive.'
When the constitution is subverted, the kind of behavior we saw in Guantanamo and Abu Ghraib, and which occurred in foreign interrogations at the bequest of the United States, prevails. Investigations and prosecutions where those are appropriate would shore up the rule of law, and thereby strengthen the government.
Yesterday I met with a Bar Mitzvah student. His Torah portion will be Mishpatim. Initially he was having trouble finding the text interesting - it was just a series of laws: what to do if your ox gores someone; what to do if your donkey falls in a pit created by someone else; the punishment for assault. We talked about what kind of society the Torah was trying to create, and what the society must have looked like without those laws. The moral and political order created by the Torah creates the kind of foundation upon which societies upholding human dignity are built.
So, hooray for prosecuctions. To quote our last president: "Bring 'em on!"
Rabbi Melissa Weintraub began as a rabbinical student to explore this issue and created some incredible resources on torture and the Jewish tradition. There are four documents which can be found here.