Tire Blowout problems of the 2010 Volkswagen Jetta

Large split in the front right outside sidewall discovered. Upon inspection, gap was very noticable. Check the remaining three tires and no evidence of the same. Tires have approximately 15,000 miles. We decided to replace all four tires to keep the vehicle "balanced". New tires installed and was asked to come in to the shop to see the other three tires. All three had splits in the sidewall facing to the inside, which could not have been seen unless each tire was pulled off the vehicle. I asked to retain at least two of the tires in my possession, which I have now. I also have pictures of the splits that I hope I will be able to forward somewhere before I complete the complaint. Although there was no injurys, it could have been very catastophic if the tires blew out at freeway speeds.