Who blew up the plane and why?
The Report does not speak to that. It speaks to the physical evidence of explosion, and falsifies the theories of poor piloting and plane disintegrating at impact.
If I read correctly the wing went 1st, probably from impact on a tree and sparks or engine heat ignited the fuel. The rest was chain of events.
I still think the ruskis induced the situation, like altering the Glide Slope, etc.