Tire Blowout problems of the 2007 Mazda CX-7

I have a Mazda 2007 cx 7 with bridgestone tires. I have 25,480 miles and do not carry anything heavy. The car is usually used for local travel wih 1 person in it and no more than 2, both of us together weigh less than 300 lbs. Two of my tires have to be replaced and another one within the next 1000 miles. People who have purchased this model have been complaining about tires wearing out at 22,000 miles and Mazda nor bridgestone will do anything about it. This is a potential problem in which tires will blow out causing either property damage or loss of life. I have not replaced the tires yet, so they are available for insepction. People purchasing these automobiles should have been told that these tires wear out at around 22k miles, since I would have either asked to have the tires replaced or I would not have purchased the car. When you purchase tires from a auto shop, they indicate the normal wear of the tire. All new autos should have the same requirement. I think that bridgestone used inferior rubber to make these tires since the weight of the auto may have an effect on the wear of the tires.