Obviously there was nothing DC could do to pull the comic out of circulation by then (not to mention that their offices are in downtown NY, so they probably had other things on their mind at the moment). They did make the comic returnable, but few if any were actually returned, because people understood that this was nothing but an unfortunate coincidence and not DC's fault.
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beause they were a legitimate target for attacks
just saying
none of the coincidences in this article were too amazing