Did it ever occur to you that maybe they were moving large pieces of wreckage to get to the decomposing body/parts of a person. What would you prefer, leave them under it rotting or move a piece of wreckage that has fallen 33,000ft to its random resting place. Did they lift it and take it away? You don't know and neither do I as it was only reported that they were moving wreckage and disturbing the evidence. I expect they lifted it, removed the body and then put it back.
I honestly think it is quite disgraceful how this is sometimes being reported and it is obviously having the desired effect on the people who just soak it up without ever contemplating why.