There’s always a negligible chance that one of these high energy experiments could potentially destroy the world.
Similarly there was a small chance that the first test of a fission bomb would produce a chain reaction that would consume the entire earth. By the time they t este it they thought it was very unlikely, but the odds were still greater than 0. (See Oppenheimer movie for a dramatization of this.)
So the people worrying are mostly idiots, but there’s always a tiny chance.
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