Re: Can someone explain....
Oh go on then, I'll bite.
First up they are not used to "to work out that a nuclear war will wipe most of humanity of the face of the earth". That's not AWE responsibility. They serve 2 functions.
First they verify that these things we taxpayers pay craploads of money to have still work decades after one was last tested. I as a taxpayer am interested that this is done. It is an economic viewpoint that is totally unrelated to my opinions as to whether we should have/keep them.
Second they verify that as they get old they aren't going to go kablooey unrequested. I'm interested that this is done from every viewpoint.