A-Van, the DSB report needs to be seen in its totality, not just in fragments.
The case is built from the wreckage evidence backwards - damage and break-up sequence lead to a cause outside the aircraft, a shrapnel producing detonation to the left and above the cockpit area. Only way to get such an explosive device there is by way of a weapon system. Deduction of all available knowledge and evidence leaves only a specific type of warhead as culprit. That type of warhead is only delivered by a few models of rocket, launched by BUK system.
Sufficient military intelligence material is available to then calculate from where a missile COULD HAVE BEEN launched, in orde to deliver its warhead in the position where, according to available evidence, it detonated near MH17 cockpit.
Dutch safety Board does not go any further than to display that whole possible launch area and does not appoint any perpetrator.
The years of testing and validating that an arms manufacturer goes through does not imply that NLR needs years to figure out the possible launch area - the years of effort to gather information about SA systems have taken place long before MH17 was killed - remember that back in 1973 SA-6 systems operated in the Middle East and not all systems remained in the hands of the armies that received them from the Soviet Union ...