Human emotions are so unpredictable and so variable that what maybe tasteless and odd to some maybe normal and accepted to others. Back in SL people celebrated the death of the LTTE chief Vellupillai Prabakaran in a similar fashion as mentioned in the OP and while that may have seemed cold blooded and messed up to some,the families of the victims of many of his bloody bomb attacks thought otherwise. Ultimately to each his own..Personally I worry that such celebrations will be provocative to all those OBL wannabes who will now want to take his place and fight his cause..Audubillah!