Exactly. State currencies have their issues, but they do at least accept that a currency built only on faith and trust must be centralized.

I am proposing that making a currency decentralized creates certain limitations. Without a central authority its extremely unlikely that a monetary system built on faith will last long. For bitcoin the claim is that the network is what you must have faith in, not a central authority. I don't find that compelling personally, mainly because I haven't found the protocol to be so bulletproof that I only need to trust it and can believe that the network will hold regardless of how many bad actors may attempt to corrupt it (not saying that is happening today, only that it is inevitable with time).

> mainly because I haven't found the protocol to be so bulletproof that I only need to trust it and can believe that the network will hold regardless of how many bad actors may attempt to corrupt it (not saying that is happening today, only that it is inevitable with time).

On the plus side, the protocol effectively has a built-in bug bounty program! :-D

bluntly put you can pay taxes only in that currency and governments have power to enforce it, meanwhile btc has only as much power as currencies you can exchange it to. If you couldn't exchange btc to fiat, it would lose value rapidly.