Nonsense. The roof part in question was used based on photographs, because it wasn't delivered to the investigation until an RT documentary about it had aired and the analysis was already done. In other words, it wasn't used because Russia was deliberately hiding evidence. Yes, those parts could have provided important clues, but since it wasn't used, there is no way to tell whether it would have confirmed the board's other findings or contradicted them.
Why did Russia hide some of the debris?
You were wrong before because you hadn't watched the presentation. You didn't even know what tests were done.
You've made the same mistake here because you haven't watched the documentary, so you're just making thing up again.
Do you know why you're wrong? Watch the documentary and find out
Does it also prove that jet fuel doesn't melt steel beams?
RT 'documentaries' are not in the class of "things that are not a waste of time when trying to become informed". You may have found something persuasive in that film; many people find Kent Hovind's descriptions of the origins of life persuasive too - but I don't have to watch any of Kent's videos to know that I would be wasting my time to watch all of his videos. He and his supporters would also say things like "Do you know why you're wrong? Watch the documentary and find out
" - but they would be giving poor advice, based on the false assumption that others are equally as gullible as they.
The fact is that the OVV is a hugely professional organisation of apolitical experts in all aspects of aviation and other transport incident investigation. The probability that a political influence could be brought to bear on such an organisation without at least several of the truth-obsessed geeks who work there blowing the whistle is as close to zero as you can get - these are people for whom finding and publishing the facts is an absolute fetish; they simply do not all suddenly decide to falsify their reports for political reasons, and many of them would rather lose their jobs and livelihoods than compromise the truth in that way. Air Accident Investigation is a specialised field made up of quite obsessive truth seekers, who have an ingrained aversion to ignoring or falsifying evidence. If another organisation disagrees with their findings, then the probability that the OVV ignored that organisation, or that they would change their reported findings to suit the political ideals of that organisation, are nil.
Air Accident Investigation is deliberately separated from criminal investigation, specifically to reduce any possibility that political or emotional considerations could corrupt their findings; the sole objective of an Air Accident Investigator is to prevent a recurrence of the accident under consideration. They don't care about blame; they care about not having it happen again; and they care about the facts.
You might live in a world where everything is corrupted by political shenanigans, spin, propaganda and outright lies. But the engineers and forensic specialists of the OVV, like their counterparts at the NTSB, the AAIB, CASA, and all the other similar bodies around the world don't live in such a world. They deal with facts. They are uber geeks - fraud is totally unnatural to them. They may work for the Dutch government, in terms of who sends them their pay-checks; But they are not the Dutch Government, and they don't give a flying fuck what the Dutch Government or any of its politicians want. Nor do they care what Russia, Ukraine, the USA, Australia, or any other nation or their politicians think. Stop wasting time on dodgy presentations from companies with a direct conflict of interest; stop even looking at this particular case; and instead invest some time reading other OVV reports about other aviation accidents and incidents. Get a feel for who these investigators are, and what they do. THEN come back and read their report.