The concept of 0 and of putting it with the number 1 is still a viable analogy, nonetheless. Using the Roman X is another way of not using a zero, not another way to dispel a concept completely.
I simply allow for the possibility. We should all doubt. And doubt our doubts as well.
I would doubt if I could, but all doubt has been erased for me due to direct experience. But I do expect people to doubt, and doubting is fine. It's simply not an option for me anymore, although at times I wish it was. And that is the honest truth.