Nitto Invo's

I know this is about my SRT and not my Valiant but bad service is bad service. Got the 300 out and brought it to the shop to get ready for spring/summer. Lifted it to walk around and found this. The tires are 18mo old with less then 7,000 miles. All measure above 7/32's. Nitto's position is the dry rot is not bad enough to be warranty. When it gets worse or fails then we will look at it again. What BS!