The War on Iraq was portrayed by the Bush Administration as a legal, an inevitable step to protect peace, and American security against an undemocratic regime. Today, years after the war began it is even clearer that the war does not fit the Just War Theory.
Just Cause: Was not met since the coalition forces did not locate any of the feared weapons of mass distraction. Furthermore Iraq was not an imminent threat to the United States, or to other states.
Right Intention: This is also a requirement that is debatable, since the US’ intention was to provide democracy, to build a new state, however the Iraqis seems like do not want a Western democracy in their country. They do not share the same values and cultural norms with westerners. In Iraq the cultural diversion is so high that a war can only make the intense diversion more complicated.
Proper Authority: From many aspects the war on Iraq was not authorized by the UN and was against international law. The Americans and the British forces entered into a hegemonic war to expend their own values, and to promote their own values.
Last Resort: In the case of the war on Iraq the US deployed an enormous force in the area, the border of Iraq that gave a clear indication that diplomatic solutions have no chance to resolve the conflict. Other than that the US refused his own allies proposals to continue with diplomatic solutions to the conflict.
Probability of Success: There were no plans to foresee what could actually happen in the country of Iraq by the removal of Saddam Hussein. The American strategy did not calculate a lot of problems that could result in a civil war.
Proportionality: The war in Iraq made the world not safe, but more fragile as far as international terrorism is concerned.