And we know this is not true, we have seen the economy of single countries fail spectacularly just in the last decade and it is likely the fiat system will fail as well at some point in the future and yet they have no way to protect themselves from this obvious danger.
Talk about what is better security - gold or Bitcoin, has been going on for years. But in my opinion, you can't just stand for one of them. I think that the best form of escape in the event of a financial crisis is diversification in several different independent ways: gold, Bitcoin, real estate, works of art, diamonds, and may be even less known forms, such as stamps. The more of them the better. But ofcourse it all depends on form of the crisis. For the fiat money crisis for sure Bitcoin will be the best form , because his value will be rising proportionaly to the dump of fiat value.
And there are many other problems with real estate, you need a lot of money to buy it on the first place, it is not mobile so your wealth is tied to a particular place, it can be subject to vandalism and in the case of a crisis it can be very difficult to sell.