There is a minimal difference between the left and the right rear tires. A blown damper does not exactly cause a tire to wear prematurely in one area; alignment does. A blown damper will create "cupping" or "feathering" pattern.
Claim and replace the blown damper, check alignment, and swap the left and the right tires if that will make you feel better. No need to be angry.
PS: I presume you are a car person, why KYB ? Why not Koni/Bilstein/such ?