Also, an economy is dependend on the honesty of its users. Bitcoin is already the most fair and neutral economical system ever created, so it is a shame if honest people ditch it in favor ofa currency controlled by corruption.
Discussion
I get your points. He'd probably say that the potential disruption and chaos which would occur, should the world go from a USD standard to a bitcoin standard would generate a lot of injustice as well, simply due to the fact that bitcoin is not evenly distributed, but has a high concentration on relatively few hands...
But in the proofof work model, this money has to flow to the productive side of the economy, the working class.
with fiat, there is no guarantee for this, because rich people can bend the rules and force people to reverse transactions or to pay money to the government. With bitcoin this is impossible, possibly opening new chapters in africa