Ten years ago the United States invaded Iraq in what was sold to the public as a "preventative war." The presumptive causus belli for the invasion was the supposed mass stockpile of chemical weapons possessed by Saddam Hussein; to date, while some weapons have been found, the stockpile has not and is now believed to have been destroyed at the time of the invasion, or before that.
It was supposed at the time that "every intelligence agency knew he had them." However, the CIA and MI6 told President Bush and Prime Minister Tony Blair that Iraq had no active capacity for chemical weapons before the invasion, but the leaders started the war anyway. The Senate's then #2 Democratic leader knew that Bush was lying America into war and let it happen anyway, so they can't claim clean hands either (and don't).
Two men, Blessed Pope John Paul II, and then Cardinal Joseph Ratizinger, vigorously pointed out that the very concept of a "preventative war" was against Catholic teaching and attempted to persuade the U.S. against this. They stated that the Christian people in the Middle East would suffer the worst from Bush's and Blair's folly, and the Marytr's blood shed cries from the ground for justice.... [I]n the face of the tremendous consequences that an international military operation would have for the population of Iraq and for the balance of the Middle East region, already sorely tried, and for the extremisms that could stem from it, I say to all: There is still time to negotiate; there is still room for peace, it is never too late to come to an understanding and to continue discussions. John Paul II Angelus March 16, 2003 Cardinal Ratzinger in September 2002:
The "concept of a 'preventive war' does not appear in the Catechism of the Catholic Church," Cardinal Ratzinger noted.
"One cannot simply say that the catechism does not legitimize the war," he continued. "But it is true that the catechism has developed a doctrine that, on one hand, does not exclude the fact that there are values and peoples that must be defended in some circumstances; on the other hand, it offers a very precise doctrine on the limits of these possibilities."