Welcome to the Forum Eduardo.
Here is, in part, what your Warranty Guide states;
Two separate warranties apply to tires on your new vehicle. The New Vehicle Limited Warranty covers tire defects in factory supplied material or workmanship for 100% of labor costs and on a pro rata adjustment basis for parts.
You can read the rest in your Warranty Guide.
As for the statement, " It's more senseless of Ford and its dealers to deliver cars knowing that these tires are defective.", I don't believe that is correct. Considering all the Explorers with Hankook tires 'out there', it would appear that only some have had issues. When I was on a Toyota forum, there were also many complaints about the Toyo tires that came with the vehicle. Tire complaints are nothing new. Except for a balance issue with the ones on my Platinum that dealer corrected, I have not had any issues with the Hankooks that came on my 3 vehicles.
Peter