2011 MINI COOPER COUNTRYMAN Wheels Problems

AT A WARRANTY SERVICE FOR AN EXTERIOR TRIM ITEM, THE MINI TECH WENT TO VERIFY MY MILEAGE AND ALSO EXAMINED MY RUN-FLAT TIRES IN DETAIL (GOODYEAR 225/45 R18 EFFICIENT GRIP). HE ADVISED THAT TWO TIRES HAD DEFECTIVE SIDEWALLS AND SAID THEY NEEDED TO BE REPLACED. HE EVEN RECOMMENDED A DIFFERENT BRAND. THE TIRES WERE UNDER WARRANTY AND I REALLY HAD NO CHOICE BUT TO HAVE THEM REPLACED UNDER WARRANTY TERMS. BECAUSE IT WAS AN AWD VEHICLE, I CHOSE ALSO TO HAVE ALL FOUR REPLACED. 4000 MILES LATER, I NOTICED A SIDEWALL BULGE ON ONE OF MY FRONT TIRES. I COMPLAINED TO MINI THAT THE TIRES THEY WERE PROVIDING WERE DEFECTIVE AND HAD I THOUGHT MORE ABOUT THE MINI TECH'S ACTIONS IN THE BEGINNING, I WOULD HAVE SUSPECTED THAT MINI WAS AWARE OF THE PROBLEM AT THE OUTSET. MINI USA RESPONSE WAS AS EXPECTED, GIVING ME A LECTURE ON WHAT CAUSES...