We (they) do consider all possibilities, and then choose the one we (they) go with.
Like being on two sides of a street. Which side will I choose? I will choose the one that suits my needs and desires, right or wrong.
If I believe that there is a store on the other side of the street that has things I want, and although I cannot see the store, I believe it is there, so I will cross the street, and take my chances with the traffic.
I know that staying on this side of the street, that there is no store, and so it is my choice to cross.
So my choices are....one with no store for sure....or... one with possibly a store... or not. But a chance I will take, just the same.