Operation Dark Storm

Operation Dark Storm was basically a mass suicide move on the part of humanity. Yet it is shown to be met with unanimous approval, with even the facial animations of the humans responsible showing a complete lack of intelligence. They apparently have forgotten that all the things humans need to survive also require the sun. And by blocking the sun, it means the death of vegetation and phytoplankton, everything living that relies on those as well, and which destroys the foundation for most of Earth's biosphere. Even if they had an alternative, they basically ensured their own near-extinction unless they assumed they would win inside of a week. They also either never developed a killswitch, or it was lost/destroyed in the ensuing war, dooming whoever won to imprisonment on a dead husk of a planet, as the cloud disables anything that flies through it. And also, thanks to the lack of sun, sicknesses are easier to get. And because of all this lack of intelligence, the humans end up losing the war against the machines and end up being their new power source.

Example of:
Too Dumb to Live