Why is that irrational as opposed to improbable? Please define your terms if you are going to use them outside thier traditional meanings. Or are you saying anything improbable is irrational?
No, not at all. I am saying if you take his word for it with no proof that would be irrational. Arbitrary claims should not be considered. For example if someone published an article saying that the ice age was caused by a temporary fluctuation in the freezing point of water to 60 degrees instead of 32 and when it fluctuated back to 32 the Glaciers melted. That would be an arbitrary claim just as the Earth was created in 6 days or unicorns exist is arbitrary. To believe it is irrational.