They once believed that bitcoin is backed by nothing, but I guess bitcoins are backed by those people whor are currently fund of doing them. Those who are really interested in doing so and are sure of practicing it.
You can say so, yes. I believe in the same thing also despite all the statements that says otherwise towards this belief of us Crypto currency lovers. And even though some of these negative comments on bitcoins that a lot of people says sometimes makes sense, if you truly are a believer and an investor of this coin, you will ignore them because you know to yourself what really is right(considering that you really did your own research about bitcoins or the crypto world). Some people just cannot accept their mistakes even when they know they were wrong just because of their prides. That's just how people are.