You might be thinking too much.
Some islamic nuts wanted to seize the US Embassy and the Syrian security forces, out of their own sense of survival - not love, decided that they need to prevent that from happening.
Sometimes a cigar is just a cigar.
No one can fart in Syria if not allowed by the Syrian Baath terrorist regime. For terrorists to mount such an attack without the knowledge and approval of the Syrian intelligence is not possible.
Yes, but sometimes its a super secret CIA assassination weapon, mounting a 10mm recoiless rifle, with a frozen ice projectile, that leaves no evidence. ;-)