In order to prevent a nuclear war, you need consensus. Anything less than 100% buy-in is insufficient. Going back to the neighbor example, someone being loud a

In order to prevent a nuclear war, you need consensus. Anything less than 100% buy-in is insufficient. Going back to the neighbor example, someone being loud at 2am is a lack of consensus. In order to be productive as a group, you need consensus to be quiet when people are sleeping.