basically, BT value is virtual and can be erased in a snap.
on the other hand, dollar value (as any other currency in the world) is virtual and can be erased in a snap
See, the whole concept of "value" in economics terms is inane. Nowadays, the amount of actives in the whole world (I mean: THE WHOLE WORLD), amounts for around 1/4 of the "value" of money (considering money as an obligation from government A to give you some amount of gold, silver, other currencies, etc). To explain it in layman's terms: there's only 1/4 of the amount of money that is actually backed.
Even simpler: let's say tomorrow Google decides to simply unplug and close doors. In real economics, the impact is shallow: just some obligations to cover, some indemnification to employees... nothing we didn't see 1 million times. There's no real loss, the people that used their services can use another without losing a dime, nothing happened. However, in today's virtual economics, it would crash the world's economy. As simple as that.
With all of the above said, bitcoin is as safe or unsafe as any other currency. If you wanna be safe, invest in goats, cows and chickens. That will always have value no matter what
