the air bag sensors are usually located in the mounting brackets for bumpers on older vehicles... so if you missed the brackets they wont really go off. if you hit a car with the same lose of control, since it is a flat surface the airbags probably would have gone off. since you hit the pol in the middle of the bumper, it is a very small impact zone your bumper mounts probably stayed in tack and that's probably why.
with newer vehicles, they have g sensors. if they get set off then the airbags go off. take the camaro for example. the new camaro airbags are controlled on g sensors. if you try to drift them and the axle catches and you slide the rear end to the opposite side you started the drift, the airbags go off because of that force. it is a very popular video on youtube and you can check it out.
with this being said, theoretically the airbags should have gone off, but because of where the pole hit they didn't trip the sensors. if it was a new dodge the airbags probably would have went off.
I am sorry for your lose hopefully the insurance company works things out with you without any trouble!