You don't say that sausages are worthless just because the dog ate a couple that were left on the kitchen counter.
The problem may be the dog, or the lack of discipline by the owner, or whoever left the sausages out on the counter, but the one thing free from any accusation of blame is the fucking sausages.
There is a confusing entanglement between the thoughts about the technology vs the thoughts about actually doing financial transactions with it. I have admiration for the developers and awe at the websites, games and services that were spawned, the technology. As a financial construct it's a perfect storm for exploitation; human nature + unregulated hyper-capitalism = bad.
Regulation is required, As much as for banking because consumer funds are being stored and / or transferred.
FTX was just grossly, fraudulently mismanaged and I'm not actually sure the exact machinations of regulation that could ensure that kind of thing doesn't happen - regular reporting of figures, independent audits, etc, but then with the money FTX had been throwing around it would have been easy to fake reports and pay for clean audits (in my layman view of a very complex landscape).
But that won't happen because money laundering is a religious belief. Instead we'll just get more stupid attempts to watch the watchmen.