Re: Can Bitcoin withstand attacks by state-level agents?
They'd have to spend insane amounts of electricity (inb4 energy shortages) to... prove their point. Would Greta approve that?
Of course she would. Just pay an insane amount of electricity temporarily to ruin the currency that "destroys the environment". 
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This explains well why state-level agents wouldn't attack the network with the intention to steal bitcoin, for example by purchasing billions worth of bitcoin and then shorting them right before they reverse the transactions. Doing so would require a lot of time, which is translated in a lot of blocks, and therefore a great cost in reorging those blocks. But, in my opinion, it makes no sense for the state to attack like that. Instead, it's more likely that one of the following will happen:
- It already has an effective way to steal bitcoin. It's called tax department, and of course it can impose tight(er) regulations.
- Otherwise, a simple 51% attack will do some work to destroy the reputation.
It will depend on whether the state wants to destroy Bitcoin or to acknowledge it and welcome it as part of the system.