How can the lumbar control switch stick and burn out the lumbar motor? on 2010 Honda Accord

The lumbar support on the driver side power seat stopped working. I checked the fuse to the lumbar power and it was NOT blown. The Dealer said the switch had stuck and had burned out the lumbar motor. How is it that, that much of a short did not blow the fuse? The car is still wuder warranty and the dealer will fix it.

Asked by for the 2010 Honda Accord
could be a faulty switch I would take to it the dealer to see if it is under warrwnty