What do you mean “the left”? The farther left you go, the more people see firearms as important for the people to fight oppression. Karl Marx—pretty much as far left as you can go—was very adament about wokers owning guns.

I think you are trying to refer to authoritarians.

I think Bitcoin was a good proof of concept that this system can work and scale. Ethereum is trying to be the viable option. I personally like Monero. I am sure in a hundred years or so if crypto is still here, it will be more viable and stable.