I know that is impossible here to have a rational and correct discussion when some kind of accidents happens, expecially when the US military forces are involved, but, since I am a stubborn stupid Italian, I want to give my useless contribute.
Fact:
1) A car carrying the ex-hostage and few secret agents has been shot by american troops.
2) One of the agents died protecting with his body the hostage.
3) During the operation the agents were in continuos contact with the central command in Italy, and the plane was ready to take off on the RWY of Bagdad Airport.
4) The agents already made operations before in the same ambiental situation, including the recover of the other 2 italian female hostages.
5) Due to facts 1 and 2, Berlusconi, Italian prime minister, called the US ambassador for clarification.
6) Due to facts 5, the US president, Bush and C. Rice called the respective counterparts of the Italian government to express their feelings for the unfortunate accident.
7) consequently of fact 6 the US president has called the pentagon to actively search for the truth, assuring Italy's prime minister that he will be informed of any discovering.
8) Afaik, the pentagon has not taken any position on the event, probably waiting for the findings of the inquiry, to avoid dangerous mistakes (remember the wedding party case?)
Up here and now, theese are the known facts.
Declarations:
1) The surviving agents affirm that the car was not speeding, and that it was'nt a check point, thay declare that, while moving on the highway, an APV suddenly opened the lights from nowhere, and immediatly opened fire on the car, and took a while before the soldiers realized that they were shooting a friendly car, and after the gunfire they took away all the satellitar phones from the victims, realizing they were still in contact with Italy.
2) the "Checkpoint" version has appeared only in US press, immediately after the incident, it's not official. (AFAIK)
The rest is political BS, or the reaction of a shocked woman.
We have to wait for the conclusion of the inquiry, before wage Hyperbolic accusations of a killing attempt in Clancy's style, or blaming the dead to have attracted bullets coming from nowhere.
In the meantime, I praise you to respect a man that gave his life to protect the hostage, even if it's not an american guy.