There's plenty of solid, non-conspiracy-theory-based argument in favor of decentralized systems...for many things. I don't think currency/banking will ever be one of them.
The Canadian truckers and their supporters would like to have a word with you.
As would the citizens of Cyprus and Sri Lanka who will have or have had funds from their Bank accounts taken because the powers that be decided that the customers money was better off in the banksters hands.
As would the citizens of Cyprus and Sri Lanka who will have or have had funds from their Bank accounts taken because the powers that be decided that the customers money was better off in the banksters hands.