>>27
True randomness doesn't exist.
With the cat in the box example, it should be possible to find out when the trigger is gonna switch on - with sufficiently advanced technology. So alternate universes waiting to be created from true random events would never come into existence.
As for the scientist and his gun example, no matter how important a scientist thinks he is, his death has no bearing upon the reality's existence - why should a reality decide to split because some small fly dies? It doesn't make sense.
OTOH if one built a machine to visit alternate realities, then here we have a "random" event, or rather an external tampering with the reality's structure. Only them would the reality find cause enough to act up and split, IMO.