See: You Be the Jury, The Amanda Knox Test
While we hear about Bayes' Theorem being under threat in some courts, it is nice to savor the occasional moment of rationality prevailing in the justice system, and of mistakes being corrected.
Congratulations to the Italian court system for successfully saying "Oops!"
Things go wrong in this world quite a bit, as we know. Sometimes it's appropriate to just say "hooray!" when they go right.
Discuss, or celebrate.
If we are going to have any success at things like raising the sanity waterline, we need to understand how and when human reasoning fails. And we need to appreciate how much that depends on circumstances. In the same way that almost any of us if we were born in the US in 1810 would have been in favor of slavery, and almost any of us born in 1930 would have been against interracial marriage, it is important to understand that we don't have some magic gift of rationality. If one of us were in the same situation as the Kerchers, we'd likely react the same way, and I'd go so far as to say that even someone as highly rational as most LWians with all the experience and awareness of cognitive biases would still likely react the same way.
To destroy bias we must understand it.
I don't see a motivation that the Kerchers would be motivated to harm Amanda Knox other than their belief that she killed their daughter. In this context, what do you think is the underlying motive that they are engaging in self-deception to accomplish?
They -- and their lawyer -- have a pecuniary incentive to seek a verdict against Knox and Sollecito, since it would entail the imposition of monetary damages in the millions of euros. Needless to say, Rudy Guédé's financial rescources are almost certainly not comparable to those of Knox and Sollecito (even though the latter two aren't themselves extraordinarily wealthy).
Of course, this probably doesn't directly pass into their conscious motivation; but it still likely affects their judgement.