I think the reason for this absolute hatred of crypto is that the predominant modern leftist mindset depends on a belief in governance making everything better

how to fix healthcare? more government involvement 

how to fix income inequality? more government involvement

crypto is an oil and water situation when it comes to this mindset

one of the most OBVIOUS governmental duties is issuing currency 

crypto being legitimate would mean that this, a basic core use case of governments, is outperformed by the free market

it's easier to block out the possibility of this being true than to adjust your fundamental worldviews

“I’m with the government and I’m here to help”