One of the most valid criticisms of Bitcoin is that it reduces the ability of the Unite States to sanction enemies of the West
What's a good argument here, beyond "well the dollar-based sanctions weren't very effective anyway"?
The root problem isn't Bitcoin or other cryptocurrency, but rather other country which willing to make deal with sanctioned country. And using local fiat (which issued by one of the countries) generally is better option due to it's stability (compared with BTC).