Before you get mad at Subway, know that this was actually created by "The Onion" as a way to poke fun at the disturbing September 11th promotions that actually happened, unlike this one.
September 11th should not be seen as a promotional opportunity. It should always be respected and honored. However, some national brands like AT&T, Marriott, and Pretzel Crisps gave their 9/11 promotions a go and failed miserably.