Can you list an alcohol manufacturer who has patented a method of preventing people from drinking while driving? Or a car manufacturer who has patented a method of preventing drivers from changing the radio station? Apple went that extra step and patented a method of preventing the drive from using Facetime while driving. If they had not done so, I would argue that this is a completely frivolous lawsuit and should be tossed out on the merits. However, they clearly think there is a need for such a method to the point that they spent the money to develop and patent one (OK, I do not really believe that, I think they just patented it so they could skim some money off of anyone else who actually developed such a method). Then they did not implement this method which they had developed.
It happens that I would ordinarily oppose lawsuits such as this one. However, in this case, I think Apple patented something which they did not believe actually worked, so that if someone else figured out how to make it work they could get a piece of any profits.