I think this Quote fits here
A friend of mine posted a quote from the Joker recently and I think this fits well for us and why we discuss scenarios and what if situations.
"Nobody panics when things go according to plan. Even if the plan is horrifying."
I think this fits well with the "what if" thinking, if we are thinking "what if" then when something does happen not only are we not surprised but we are not panicked because we have planned for X and even though this is Y they are similar enough to be able to adapt to it.