2011 X5 50i bald tires 12,000 miles, BMW will not warranty it!

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My front tires are bald on the outsides at 12K miles. 20" factory original bridgestone dueler H/P sport 275 40 20. My car has never been in service, have not had one issue with it (knock on wood) went in for my complimentary oil change, and showed dealer. They told me I need an alignment which is not covered under warranty or free scheduled maintenance. They said it is my fault for probably hitting a pothole and throwing the alignment out. Car tracks perfect, no pulling to either side on steering wheel, seems perfect. Dealer wants 299.00 for a 4 wheel alignment, plus I have to buy new tires (279.00) each plus tax install disposal fees blah blah. About 1000.00 total. To my knowledge I have never hit any major potholes. I think maybe it was aligned incorrectly at the factory. I think they should cover the alignment and sell me tires prorated. I thought u had everything covered except gas and tires from normal wear, say 25-30K miles. What should I do?