re: Perhaps the point is that you have no curiosity, or alternately.......
You assume that everyone should know what caused the sounds. If you have conclusive evidence of the cause of the sounds, then please let everyone know so they will stop wondering about the cause.
Personally I agree with the Israeli Air Force officer.
The IDF said at the time the blasts may have resulted from a rare combination of IAF activity over Gaza and a unique weather conditions.
An Israel Air Force officer said at the time, "this is an unusual phenomenon in which cold and warm layers are alternately formed in the air, and the sound waves move like a ping pong ball between the ground and layers."
Excerpt from here.
The reason why I agree with the Israeli Air Force officer would be very time consuming to explain, suffice to say that the phenomenon is something that has not been studied sufficiently from the scientific perspective, although the phenomenon has been relatively common in cold northern climates.