Please don't confuse AI researchers and AI safety researchers (although there is some overlap.) That's like confusing the people from the Manhattan project with the people who protested 3 Mile Island, because they're both focused on nuclear technology. One effect of EA is that every AI researcher says they're trying to make the world better. Some of them are full of shit, but not all.
I'm fairly certain the authors would be happy to see AI shut down indefinitely. They just don't believe that the coordination problem is solvable. This is their best attempt to come up with something workable in the real world, or at least get people started thinking about it.