If it helps, there's no hard and fast rules...
It's just that some pictures put people off a lot more than others - this one in particular causes a bit of discomfort, whereas other things such as the twin towers are more of an abstract concept, thus more tolerated (though not completely). That said, there are certain WTC pictures that are also not guaranteed a welcome on here...
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Sonic James Doom forgetting the date since... umm...,
Thu 21 Aug 2008, 17:24,
archived)
The chap jumping being one, I seem to recall.
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Captain Wow currently being a cunt in Infamous,
Thu 21 Aug 2008, 17:26,
archived)
Exactly the image I was implying.
"All or nothing" is a principle I can understand in theory, but in practice, some things are just too much for too many people...
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Sonic James Doom forgetting the date since... umm...,
Thu 21 Aug 2008, 17:29,
archived)