Surprisingly, this story is a little exculpatory. It indicates that the ambulance companies themselves, as well as the Red Crescent, may not have been co-conspirators, at least in this particular smuggling ring.
It should not be as exculpatory as it was. Assuming that the Red Crescent ambulance companies themselves were not complicit...when and where were the ambulances reported stolen? That is critical information. Asssuming the ambulances were actually stolen, the Israelis should have been notified of their possible use by terrorists to infiltrate.
I would suggest that the Israelis install tamperproof GPS locators in ambulances. Then they can track them, and any that is stolen acan be promptly recovered, and any that comes through a checkpoint without a GPS will be stopped. Even just knowing where they go would be valuable if the terrorists are using them as taxis.