Actually, the important point is:
Are we gonna suppress the insane ramblings?
We can suppress and ignore
We can suppress and silently make preparations
We can suppress and silently study
Or we don't suppress (large gamble)
And ignore (if nothing happens, we gain a bit. If something happens, we're getting fucked)
And make preparations (if nothing happens, we lose some face. If something happens, we gain face)
And Study
if nothing happens,
we find something: Observance disprove event
we find nothing: Observance superstition strenghtened
If something happens
we find something: Observance superstition strenghtened
we find nothing: They think we missed something?
All in all, suppress the insane guy and prepare for the worst.