Crucifying the crew is par for the course in most cases. Nothing unusual there. And if no cause is found... guess who is to blame by default?
As for the sensor software question, I believe all critical systems (including FBW/FADEC) on the a/c were developed by isolated separate design teams in triplicate using the Ada-83 standard (and later rewritten in Ada-95) and use an n-version (n=3) voting system for agreement/disagreement.
I don't think any *Boeing* crash has ever been attributed to software issues (MMI issues are something else), and the architecture has been pretty well proven and refined over the years not unlike all other engineering processes.