As are so many titles in the Bobiverse, VEHEMENT is an acronym. It stands for Voluntary Extinction of Human Existence Means Earth’s Natural Transformation. The organization might have been based on the Voluntary Human Extinction Movement which started in 1991.
The terrorist organization VEHEMENT is first mentioned in We Are Legion (We Are Bob). It may have evolved as a nihilistic reaction to the global war described at the end of We Are Legion. Its stated goal is to encourage humans to stop reproducing, commit suicide, and take any additional actions that would hasten the extinction of the species. VEHEMENT sees humans as a plague, and the primary cause of the Earth's destruction. They carry out a series of terrorist attacks across the globe, and are responsible for the hacking of Homer and the destruction of one of the farming donuts in space. Riker subsequently tracks them to their headquarters in the highlands of New Zealand and destroys it.
"We've knocked out 99.9% of the human race, and somehow the crazies still manage to survive. It just defies the odds." (208)
References[]
https://www.vhemt.org/