The reason for not chaining steering tires is because the failure rate is high, either from coming off from a improper install or material. Once this happens they can be logged in different areas that are critical to the safe operation of the vehicle...most often the steering linkage.
As for not installing them on the inside duals? It not required...and so the next time you feel so inclined, go ahead and you will know why most don't. For the average user it rarely comes to that and when it does it not 72 degrees, sunny and dry. And most unpracticed users have enough trouble installing them on the outside duals.