That's the whole idea of such barbaric terrorism. To send shivers down the spines of their poor families and others who are thinking of serving in Iraq. In our military or in an aid mission.
Terrorism is designed to scare people into going your way. Doing what you want .... in this case not coming to Iraq. In the case of Spain, voting socialist.
Same reason the Balkan and Chechnya Muslims filmed their snuff videos of grisly beheadings and tortures. To scare the other guy's military away or at minimum to take only safe ineffective actions, to hole up in his garrison a la the UN blue helmet idiots.
I just posted on another thread these comparisons, between the chechens and KLA and the "people" here. I am not sure it is only a scare tactic. I think they are so incredibly filled with evil that they enjoy mutilations, and I suspect the pics and videos are a source of prolonging the enjoyment. I used to monitor a chechen list where video discussion seemed to be very enjoyable for them, and I don't mean movies. They were discussing videos of killing and torture, call them snuff films, commonly known as they had been sold enmasse in Grozny. Before the Russians nearly leveled the place, that is. (Go Russia).
In short, I think sadism is second nature to these people. I recall the chechen chuckling in a very spontaneous way as his friend cut into the throat of the Russian.
Most literature will tell you that only a psychopath can truly enjoy these kinds of behaviors. After watching the video from chechnya I surprised myself by nearly vomiting. Can you imagine the smell of these charred bodies, and the actual close-up views of what they are doing?
There is something here which needs to be studied or explained. Why are there such strong similarities between all of these people and what makes them take such strong pleasure in death, mutilation, and grisly things?
I am thinking they enjoy sharing their grisly behaviors in order to shock us, but this is also a common behavior of a psychopath.