First of

Bitcoin is not a flawless exchange currency. (the person who told you that was improperly informed)

Bitcoin cannot give any guarantee about anything. the system is "As is" and it is still under development.

Bitcoin is just a dream of Satoshi Nakamoto and we are playing inside that dream:

If we think of good things and make conscious choices the dream will last.
But if we think of bad things and make unconscious choices there will be chaos.
I can already tell you that this dream has a beginning and it has a end.

Ironically the same applies to our current financial system. Which is someonelses dream
they are diffirent dreams but similar rules apply.

the good thinking and conscious descision making are no longer in balance for current world operating conditions therefore; there is choas.

if your currency remains in chaos long enough, it goes to currency heaven.