Air Bag On-off Switch problems of the 2008 Cadillac CTS

Car w/ 95,000 miles. Problems at 15,000 miles. Airbag sensors faulty. "ecm" (engine control module) replaced but no issues with how the car was running. Told by the dealership "alot" of ecm's are replaced. Is ecm failure common in this vehicle or is it the dealership replacing ecm's that do not need repair to make money? ecm was a $1,000. 00 repair to fix a gas smell from the car. New ecm and gas smell is still there. Then told now faulty fuel pump and leak in the fuel line as reason for gas smell. Both dealer and gm have refused refund for replacing ecm that did not have to be replaced. Replacing ecm did not fix the gas smell! prior to "ecm " all six of the oxygen sensors also replaced. Another costly repair. I have pampered this vehicle since I have purchased it from factory. Very suspicious so many issues needing repair have occurred with this car. Now, ignition switch is being recalled and will need repair. I am left driving my family around in a potentially dangerous car. Will my family be the next victim of a faulty gm ignition switch? also the door locks in the rear of the car are faulty ever since I have had the car. The rear door locks jam and the doors won't open from the outside. The dealer in the first three months replaced one rear door lock mechanism. Before I realized my warranty expired the other rear door lock also had the same problem. Gm refuses to fix it. Now an expense of > $400. Having an infant who rides in the back this is concerning that rear door lock jams. Repairs on this 2008 Cadillac Cts are endless and should not have to be so numerous considering I have been the single owner of this vehicle and have kept the vehicle very well maintained. I would like to know if other owners of this make and model of vehicle have had similar problems? is there a manufacturing issue??.