Disturbing the Scene
CAT1
Your comments regarding the bodies being left in situ are unwarranted. The deceased crew of the US helicopter that crashed in Norfolk, UK were also left in situ for three days, although covered, while the site was rendered safe and investigations and coroners requests were carried out.
The MH17 crash site should be treated as a crime scene until whatever happened has been established. This scene is in the middle of a war zone with limited resources available to conduct any form of investigation, let alone preserve every minute detail at the scene. So leaving stuff in situ as long as possible is probably the best that can be hoped for in the circumstances.
All things considered, access to the wreckage site has been remarkably open to reporters and investigators. It is unreasonable to expect Western European or US standards of scene preservation and analysis, but since it is pretty obvious what happened (in a gross sense) the minutea really doesn't matter that much.
The investigators and local population are doing their best in what are very unpleasant, unstable and difficult circumstances and are to all be commended for their actions.