Call me insensitive, but as someone who experienced 9/11 as an adult, being able to enjoy actual funny jokes that reference the attack is kind of refreshing, especially jokes created by the generation born after it happened.
I have nothing concrete to base this on, but my observation is this:
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A 9/11 joke written by someone who lived through it is more likely to be about 9/11
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a 9/11 joke written by someone born after it happened is more likely to use 9/11 to punctuate a joke about something else
Either way, I find the latter group funnier.