Well, it's not a matter of a slightly worse situation - the occupation completely stripped away and ruined the economy of the country (which was pretty great before all that), whilst creating an enormous demographic problem, which continues to undermine this country.
Perhaps i can't speak of the tragedy of the war, but then again, 60-70 years ago - there is a good part of the population which can, which does make it relatable to 9/11. I don't see these people wailing about their actually personally experienced past tragedy, when someone makes a joke somewhere.
Yeah, but my point is that what you're experiencing is a bad economic and demographic situation, not war. Your experiences are comparable to someone else somewhere else in the world in such a situation, but not to someone who's been through war.
I (obviously) don't think getting offended over 9/11 jokes makes sense, but there are some differences. The scale of the tragedy was much larger 70 years ago, but it has been 70 years. Time
does heal wounds. Not to mention that most of the people who understood what was going on at the time are now 85-90 years old. Not a demographic known for their feisty protests.