That seems a stretch of logic to me. Consider the risk v benefit analysis that Ukrainian leaders would have processed. Shoot a foreign airliner down filled with innocents and risk possible discovery of unthinkable treachery vs the possibility of engendering some amount of international sympathy. Contrary to the West's characterization, the leadership of Ukraine are intelligent enough to recognize the fallacy of such a foolish choice.
As mentioned earlier, Occam's Razor engages and it leads to a pretty clear conclusion (conspiracy theorists notwithstanding).