Obviously cryptocurrencies are sharp tools, but they're stronger financial primitives than what we have. We just need to use them to rebuild the consumer-facing components.
It is a 3000 year old problem.
Trust. In short, is big business.
If given the choice between the whims of banks vs the whims of cryptocurrency speculators, and the potential for wire-fraud vs the potential for wholesale 'hackfraud', I think I'll take the whims of the banks please.
Regarding bank whims, if you're a properly banked person who's never had an issue, great. If you've never had trouble with the IRS or anyone else who can take your money by force- great. But that's not everyone.
https://en.wikipedia.org/wiki/Nixon_shock
to give just 1 example.
Having hard limits on what governments can do is obviously beneficial especially for less informed people.
That said this is only true if you have faith in your government.