Well, me too! Though, I must admit, I also find it depressing, even alarming. For some reason, this case is what finally caused me to come to grips, on a gut level, with just how little people are to be trusted to evaluate evidence rationally. Somehow, religion, homeopathy, and UFO cults -- though technically worse mistakes -- never quite did it. Obviously, I
knew, in intellectual terms, that people were fallible, but it hadn't really
hit me; I wasn't quite
scared of human folly in the way that I am now.
What's more, discussing this (to whatever extent possible) with those on the opposite side has forced me to confront the fact that some people's brains seem to work in completely different ways from mine. I could actually see myself -- at least, a previous version of myself, perhaps -- making epistemic mistakes similar to those that cause people to believe Knox and Sollecito are guilty; but the kind of things I've been saying here and on
Less Wrong, the kind of arguments offered by folks such as Kevin_Lowe (to take one example) would have caused me to snap out of it fairly quickly. Yet they don't seem to have this effect on other people! It's as if there's some sort of fundamental personality difference between people like me and those who believe in guilt, resulting in an unbridgeable cultural gap that makes communication difficult to impossible.
I've been searching in vain to find people who "speak my language" and yet believe in guilt; they just don't seem to exist. The closest I know of is
Rolf Nelson, but he never took me up on my debate offer, and anyway I have no idea whether he still believes in guilt a year later or not.
So, to answer your questions, the evidence thus far seems to demand low probabilities for all three. The whole ethos of argument as
inquiry, or truth-seeking (as opposed to status-competition), and the whole idea of beliefs as thermometer-readings that go up and down with the flow of information (as opposed to propositions that have been "certified" or not according to some or other "authoritative" procedure), seem to be utterly foreign to almost all guilters, making them very unlikely to be able to participate in the sort of dialogue I'd like to see.
I still eagerly await the discovery of an exception.