Earlier quoted context omitted.
Anyway, it was apparently Dirac's view that there is an argument around it: > It could be that it is extremely difficult to start life. It might be that it is so difficult to start a life that it has happened only once among all the planets... Let us consider, just as a conjecture, that the chance of life starting when we have got suitable physical conditions is 10^-100. I don't have any logical reason for proposing…
"It could be ... it might be ... I don't have any logical reason, etc.." Doesn't sounds like much of an argument to me. What it does sound like is someone who has already accepted a conclusion and is grasping for some way, any way to justify it.
Given the quote, and given your interpretation of the quote, it seems that you are feeling instead of thinking (you have no hook there to suggest a conclusion is taken). Look at it rationally and it is just that: "If phenomenon P inclines to non-autonomous than adjutant A suggested". Dirac was hardly a feeler - definitely a thinker.