Fast Eddie-
The blame is still on Ford's behalf, as it rightfully should be.
Ford picks what parts go on the vehicle. They choose the suppliers. They choose the applications and uses. Ford should test these components to make sure they meet their standards. Perhaps the switch did meet standards. If that's the case, perhaps the standards to too lenient in the quality of parts and needs to be upped. Perhaps Ford was shooting for a price point and this switch meet that point, while another, more expensive switch with a better design, did not.
Bottom line is this, regardless of where the switch came from, Ford chose it for a reason, and Ford now has the responsibility of fixing it.
I'd take rattles over a burning truck any day.