Thread has gone off topic, but I'll throw my two cents in anyway.

Seems to me that the offensive thing was the murder--and the T-shirt wearer managed to draw attention back to this murder, for a moment at least. Even better, the T-shirt wearer managed to stimulate a discussion that spans continents. I'd say that this is a victory for art, for the artist, and most important, for the victim, because it keeps her story alive--