As others have noted, it seems straightforward to use Bayes’ rule to decide when to believe how much that LHC malfunctions were selection effects—the key question is the prior. As to the last question, even if I was confident I lived in an infinite universe and so there was always some version of me that lived somewhere, I still wouldn’t want to kill off most versions of me. So all else equal I’d never want to fire the LHC if I believed doing so killed that version of me.
As others have noted, it seems straightforward to use Bayes’ rule to decide when to believe how much that LHC malfunctions were selection effects—the key question is the prior. As to the last question, even if I was confident I lived in an infinite universe and so there was always some version of me that lived somewhere, I still wouldn’t want to kill off most versions of me. So all else equal I’d never want to fire the LHC if I believed doing so killed that version of me.