Twin towers 911 in advertising. Not new, so why the backlash this time?

Twin towers 911 in advertising. Not new, so why the backlash this time?

Scarred adgrunts know that the image of burning twin towers have been used in advertising before. Why the backlash this time? Was it because AdFreak posted about it? Was it simply the timing?
Humo magazine made what was dubbed the most offensive ad ever a few years back

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