The point is a general epistemological one. What I was trying to say is that there is sometimes an implicit contradiction when people say "based on what we kno

The point is a general epistemological one. What I was trying to say is that there is sometimes an implicit contradiction when people say "based on what we know right now". In a philosophical way, you could say that "based on what we know right now", the sun has always risen in the morning, but we do not know that it will rise tomorrow. But then, to plan as if it won't, is not really "based on what we know right now". Claiming something or other will be different about the sun tomorrow might, seem plausible to one person and absurd to another; that can be debated. But for it to suddenly vanish without a trace is not "based on what we know right now". Pretty much anything else is more likely. What's the meaning of saying "we have no idea" as if someone was predicting it? I am not predicting it.