So you are linking a tragic incident 24 years ago to a UAV buzzing about in international airspace monitoring a choke point? I would say the Americans are extremely carefull to keep out of Iranian airspace for a number of reasons. Linking these two events is borderline trolling.
Can we see the track of the UAV to know whether it was or was not in Iranian airspace ?
Iranians could have shot it down but maybe they went with the orders of not to but to ensure that the US knew they could.
In this way its seen as a minor incident rather than as a major one.