I don't buy this concept of the investigators and prosecutors all knowing perfectly well that they're framing a couple of innocent kids but deciding to do it anyway. That's simplistic and naive. It really never happens like that.
In any investigation there is an evidence-gathering phase, which should be neutral, with a theory-forming stage only occurring when sufficient evidence has been collected to allow informed speculation. Once a coherent theory has been constructed, then further investigation may be aimed at confirming the theory.
The two things that go wrong in police investigations, with depressing regularity, are that the theorising happens far too early, before enough evidence has been accumulated to allow this to be properly informed, and that further investigation aimed at confirming a theory becomes closed-minded and incapable of interpreting anything except as it supports the chosen theory.
This seems to have happened in this case, in spades. The theory that Knox and Sollecito were involved preceded the evidence-gathering by a ridiculous margin. The police went public with this theory far far too early. And the rest is just backside-covering and face-saving.
This is such a reasonable explanation of what has been going on, and at the same time the actual evidence is so questionable, that it seems to me completely ridiculous just to sit there saying, oh but that would have been a conspiracy and I don't believe in conspiracies.
If the time of death evidence means that the prosecution theory is absolutely untenable, then something has to be reconsidered. Once you have eliminated the impossible, whatever remains, however improbable, must be the truth. I don't think there was a wildly improbable conspiracy at all. But even if there was, then set aside the impossibility of the time of death being 11.40pm, then it has to be accepted.
Rolfe.