I think the administration has been pretty clear that they follow the NAP and they allow items that do not violate this onto the site.It is not morally wrong to own an inanimate object whose creation did not violate someone's rights. It is not wrong to buy or sell an inanimate object.This is why guns and weapons are allowed, and child porn is not. But it's up to SR - it's his/their site, they can add to or takeaway from the list however they want.