That's not completely true. Bitcoin is purported to be an alternative to fiat money because it's purported to be an alternative to gold.
The argument for Bitcoin as a replacement for fiat money actually rolls up 2 big arguments into 1:
1. That fiat money should be replaced with money backed by some commodity like gold (the Goldbug argument)
2. That cryptocurrency is the ideal underlying commodity because it's more easily transferrable than gold.
To clarify, I don’t have a strong position on either of these arguments.
Bitcoin fixes this theft problem, and demand for it will continue to increase for as long as this theft occurs.
The only way bitcoin can be stopped is if central banks start contracting the supply of their money, which you and I know will never happen.
I get what you're saying, but that's not really true. You have to account for the military spending required to preserve the legitimacy of your fiat currency. Any nation-state can afford the same printing presses you have.
Bitcoin is purported to be an alternative to fiat money, not gold. And most governments can print fiat money at will, with virtually no energy.