October 7 is the anniversary of The Invasion of Afghanistan in 2001. This was a long bloody war that would last for a generation. Consent for the war was manufactured the month before, arising out of the worst airplane related terrorist attack since the bombing of Cubana Flight 455.
Today is also the day that Obama apologised for a vicious attack on a hospital in 2015, two days before. It was a hollow gesture. Just two years later, the rules of engagement would be relaxed. The US secretary of defence said this:
You see some of the results of releasing our military from, for example, a proximity requirement — how close was the enemy to the Afghan or the U.S.-advised special forces... no longer the case, for example. So these kind of restrictions that did not allow us to employ the airpower fully have been removed, yes.
We did see the results. As would be expected, it made life even worse for the Afghan people. But it was thankfully just a case of the US getting as much murder in as they could before they would leave the country four years later.
Honourable mention to the McCollum Memo in 1940. It laid out 8 actions that could provoke a war with Japan. The US seemed to follow the plan of the memo fairly closely. They used the resulting attack to justify killing millions of civilians.