The process had to be bootstrapped somehow. And given that the world's economy at the time bitcoin was invented ran on fiat currency, it's not surprising that fiat currency was used to help bootstrap the process.
> I'm not sure what your point is here.
My point is that your original claim:
> Buuuuut, they bought it with fiat currencies, in many cases USD. So... right there the entire idea breaks down.
is false. Just because the process was bootstrapped with fiat currency does not imply that "the entire idea breaks down."