(I'm not following you, Mrs--promise!-- it's just that your posts are striking me as particularly lucid on this topic ...)
My bold. That's right: Neither Jodi nor Travis was an island or an island of two. Yet, I do not once recall anyone on either side, Jodi's or Travis', or people in their common circle, doing some hand-wringing and asking, "I wonder what I could've done?" or "I felt something was very wrong, but just wasn't sure what to do" or "now I see that there were signs that Jodi/Travis/the relationship was deeply troubled but I didn't recognize them then."
I don't mean to suggest that there was a quick fix, or an easy solution available--but, perhaps some of the damage could've been ameliorated. Yeah: where's the reflection? The critique? The--sorry for this--postmortem of the tragedy itself? It seems that there's something at stake here, and that something is showing up in the smug superiority, priggishness and the minimization of the social conditions which did contribute to the perfect storm.
That's why, to me, the she's-a-raging-sociopath-period as the final analysis is so lacking. She may be just that (though I believe her mental health profile is much more complex) but, at any rate, this summary is the verbal equivalent of dusting off one's hands and drawing one's skirts aside: it makes the whole mess seem hopeless and inevitable.