Because when you give people two options: 1. With 99% probability all remaining humans will die a slow, painful death in 60 years. 2. With 1% probability you

Because when you give people two options: 1. With 99% probability all remaining humans will die a slow, painful death in 60 years. 2. With 1% probability you will have to move homes to not get cancer in 20 years. A decisive majority of the voting people will choose option 1.