If only we had a currency that was immune to 51% attacks because a government was willing to use force to preserve its value, and therefore doesn't need a massive use of energy for its proof of work.
We call it a 51% attack an attack, but from the perspective of PoW it's always about the chain with the most work. Anyone is just as valid as anyone else to propose blocks. That's the point of Bitcoin: a way to always figure what the truth is, and make it as expensive as possible for people to attack/change this truth.
The only problem here is that PoW only knows one cost: hashing, and due to macro shifts in mining hardware this can sometimes go down a lot more than the value of a coin (which makes the cost of this attack worth it).
As soon as you start introducing measures to subvert this attack you are subverting either decentralization or stability. If you for example program clients to not accept reorgs deeper than 10 blocks (for example) you simply introduce new attack vectors that can split the network (into following different chains - which is even scarier than 51% attacks).
If every x blocks you snapshot the chain and force everyone to follow that snapshot you just centralized the chain, etc.
Due to probabilistic nature of most PoW protocols, you don't actually need to have the chain with the most work. Attacker can keep trying till they are are lucky, with less than 50% hashpower.
And the chance of successfully doing so is incredibly low, and meanwhile you're out all the computational resources you spent on your private chain that ends up being thrown out.
You'd be better off simply placing big bets at a casino
When a president tells the governor of the central bank not to raise interest rates despite the bank board's best professional judgement, is that considered an attack?
And then the governor of the central bank doesn't because they don't take their orders from the executive branch, because they're a private entity? That's actually the whole reason they're a private entity -- to separate monetary policy from politics. Them being a private entity was what Satoshi was mad about, and yet here it is, saving our asses. What if Satoshi was ... wrong about everything?
Ad hominem. It's an opinion that some "policy" is "saving our asses". BItcoin isn't undergoing a 51% attack, currently. You don't know Satoshi's identity.
Private entities still practice consensus. Just because one can't inspect or participate in the consensus doesn't mean it doesn't exist.
That’s all irrelevant to my point; I didn’t say bitcoin was being attacked. The “saving our asses” comment was that if the executive branch telling the fed how to monetary policy represents an attack then the private nature of the federal reserve represents a defense, one that’s working, or colloquially “saving our asses.” This effective structure is one bitcoin maximalists decry, and yet, it continues to work effectively. Further it’s not a stretch to attach that idea to Satoshi given the content of the genesis block. It’s not an ad hominem attack to suggest someone is wrong — even that someone’s entire thesis is wrong — the definition is to attack the attributes of someone instead of their argument, I’m refuting their argument.
It doesn’t matter who Satoshi is, I don’t need to know to opine on their ideas. That private entities practice consensus is fine (after all isn’t that just any human interaction?) and further I have no problem with consensus just the sheer wastefulness and intentional anti-efficiency of bitcoin as-is, the fact it’s waste isn’t sufficient to prevent an attack, it’s fiscal policy (inflation is fine, you’re not supposed to hold currencies) and the idea that somehow bitcoins dreadful wealth inequality will save us from the present dreadful wealth inequality. Not to mention the idea we should just defer monetary policy to a bunch of developers who hack on protocol instead of a group of trained economists. Or the idea of scarcity when anyone can and does fork coins to double the number outstanding every few weeks. Or it’s user hostility. Or it’s defenselessness to market manipulation. History won’t look kindly on this mess in a few years.
