You're talking about black swan events, rapid loss of confidence due to some uncontrollable (usually external) factor.
There are plenty of examples of marginal confidence loss that did not end in disaster....Brexit for one.
Upon announcement a large amount of confidence left the £ and headed for other currencies such as $, but it didn't result in the UK burning to the ground because the £ didn't go to zero.
Now tell me, if the Bank of England was able to reduce the amount of sterling in circulation immediately to match the appropriate confidence levels that the value of a single £ would not have remained the same.
I think iamnotback is referring to the disruption of what makes a monetary asset into a monetary asset: a recursive belief system, while you are referring to market forces of offer and demand. Of course, both are related, but iamnotback is perfectly right when he talks about hyperinflation as the breakdown of the recursive belief system.
After all, why does a monetary asset have monetary value ? It is because Joe considers it of value and is willing to give goods and services to obtain some, because he believes that Jack will also give goods and services for it, because Joe believes that Jack believes that Mary will accept goods and services against it, and Joe believes that Jack believes that Mary believes that... Joe will accept it against goods and services. In other words, there is a community of users of that monetary asset that believes that each of them believes that each of them believes that .... believes that others in the community will accept it.
This is a bi-stable system: or everybody believes it, and the belief is self-sustaining ; or essentially nobody believes it, and that non-belief is also self-sustaining. It is like many bi-stable systems, with isles of stability, and regions of instability (transition zones) between them.
When the belief is not there, the "value" of the asset is near zero. It doesn't have to be strictly zero. It can have "fun" value (collector value, joke value, ....). When the belief is there, it has a significant value. What value ? Well, THAT will be determined by the market of course, by offer and demand.
During a transition zone from non-belief to belief, there is a speculative region which looks a lot like a "greater-fool game". Early adopters may think that if the asset is going to get generally believed to hold value, they can still get hold of it for not much. During the onset of a monetary asset, fortunes can be made. In fact, a monetary asset usually starts its journey as a "speculative bubble that fails to pop".
The transition from belief to non-belief, hyper inflation, is in fact, that speculative bubble that finally pops.
A speculative bubble of which the main or sole drive is "greater fool theory" has to pop, because one runs out of greater fools. But with a monetary asset, one doesn't need a GREATER fool, just a SAME fool. This is why the infinitely recursive belief system is sustainable: the same entity can appear several times in it (like in my example: Joe believed in Jack who believed in Mary who believed in Joe accepting the asset). There's no expectation of gain.
Now, whether an external event has as a consequence a price fluctuation (a "crash" for instance) or has as a consequence a hyperinflation, depends on whether the stability island of the belief system is left or not.