Re: Take note Egypt
The explanation is simpler.
1. Go to Wikipedia.
2. Pull a list of MANPADs
3. Check which ones a passenger airliner _CAN_ evade and which ones cannot. If it is an active or semi-active IR/UV head it cannot. If it is a laser guided MANPAD it can.
4. Shortlist the countries manufacturing, the models and the operators in the region and rank them as likelihood of being given to the lunatics by a "well wishing russophobic cretin" supposedly to be used in Syria.
5. You will there _HAVE_ your explanation.
6. Bonus points for matching this to the following interesting questions about the Sinai crash:
A) what exact size of explosive _INSIDE_ the cargo hold would have been needed for it to be visible from space? Bonus points for an explanation of how anything of an airframe can survive that size of explosion.
B) why the whole front of the airframe hit the ground intact (and burned on the ground later) but _MISSING_ its engines (they are in-between the front and the tail - hundreds of meters away). Bonus points for calculating the size and type of an explosion in the hold which will rip out the engines outside the airplane and leave most of the airframe intact.