The grand assertion is that you must see the world through probability and that probability is the only guide you need.
Whatever way uncertainty is approached, probability is the only sound way to think about it.
It is dangerous to attach probability zero to anything other than a logical impossibility.
Consider the case of a person who holds a view with probability 1. Then coherence says that it is no use having a debate with them because nothing will change their mind.
Almost all thinking people agree that you should not have probability 1 (or 0) for any event, other than one demonstrable by logic, like 2 x 2 = 4.
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