I don't know about you, but I usually have better things to do with my time, besides posting on an internet chat board. So here's my reply.
What are we calling a tire failure?
1) A tire that becomes unseated from the wheel bead? That's pretty much a car tire mounted on a M/C wheel issue. Since the bead profiles of each do not match. Hence the warnings from the manufacturers, and agencies tasked with trying to protect consumers from themselves.
2) An object penetrating the casing and causing a flat? I'd say that happens more frequently with M/C tires. Why? Only because the vast majority of motorcyclists are not so desperately cheap, that they'll compromise handling and safety to save a buck. Ie: 99%? of motorcycles are running M/C tires, so naturally you'll see more failures such as punctures of M/C tires, for that reason alone.