According to all accounts, The event here seems to have involved some old but powerful weaponry (nothing to do with manpads), and some sort of local initiative. Even the Ukrainian narrative confirms the strange absence of the usual survey radar and command-and-control vehicle in this limited missile deployment.
If anything, this tragedy should teach every airline manager that a sudden military action on the ground will not occur according to a schedule.
Maybe hight-tech conflict areas should simply be avoided, as generals and bureaucrats get blindsided by the field commanders or "rebels".
This lesson should be taken to heart if any sort of conflict develops near Iran, where similar anti-aircraft weapons are said to be deployed.
Edmund