Destroying pillars of sanity

Is there a mechanic
for pillars to be destroyed without the dropping of Sanity?

I have a PC who has
'the theory of evolution' as one of their pillars. They've just seen
something so alien that it is impossible for the theory to explain
it. However, they passed an associated Stability check when they saw
the monstrosity.

Does this mean that
they've effectively managed to fit what they've seen into their
understanding of the world so the pillar stays intact, or would it be
reasonable for the pillar to be destroyed despite them passing the
Stability check?

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