Les Schwab cheating on warranty Medford Oregon

About 15 - 18,000 miles ago I bought 2 premium tires at this company (Toyo), with a 90,000 mile warranty.  I had them re-balanced and rotated at 162,826 miles (Sales person MichaelS).

Now, at 173,479 miles I noticed that the tread seemed worn more than the modest mileage of use would suggest, and I went for another tire service to the same company.  Sales person DevinJBa declared the tires worn out and should be replaced.

He explained that I had no claim under the warranty, because the excessive wear was due to faulty wheel alignment.  
I immediately had my wheel alignment checked by a specialist alignment shop, where it was declared within factory specifications.

I find such practices outrageously dishonest, and bordering on thievery.  I will give this company negative customer reviews on all online sites, and never take my business there ever again.