Bitcoin has nothing to do with fiat currency, they are distinct in their own ways. Bitcoin can be used as substitute for fiat currency and it’s not regulated by any agency or government like the fiat currency. Bitcoin does not provide any protection of value to fiat.
Many people from ancient times are still finding it hard to switch into using this type of method to store money and still glued to the traditional banking system till day. You can’t blame them, new invention usually takes time before it is widely accepted globally.
Only individuals with little or no knowledge of bitcoin are concerned about its volatility. Those who have been in the market for a long time do not panic when there is market volatility, but rather take advantage of it whenever there is an opportunity to buy more. Anyone claiming to know about bitcoin should not worry, but if they do, they may be considered beginners who are simply afraid of facing market reality after learning about it.