To doomsday scenarios like the False Vacuum Decay or that the LHC might create a black hole that destroys the world, I always have the same reaction:
My life experiences so far have shown me that the laws of physics are exceptionally stable.
In other words, if the universe is viewed like a video game for example, then whoever coded it did an absolutely superb job addressing every possible bug, glitch, exception, or exploit. Never once have the laws fundamentally broken down as a system, be that when humanity broke the sound barrier, split the atom, reentered the atmosphere, created antimatter, created microscopic black holes, or formed a Higgs boson. The fabric of reality has never once ripped or unraveled due to a paradox as is so popular in science fiction. So is the False Vacuum Decay scenario possible? Sure, under our current understanding. But I put little faith in ideas that the universe has some fatal flaw in it that could lead to ultimate doom for everyone due to one silly mistake or unfortunate circumstance.
Formerly known as "parameciumkid."