Take for example Bitcion crossing over $70k with bitcioners cheering about it then boom the German incident happened and since then bitcoin has been struggling back to $70k which was almost a new low.
Here I disagree a bit. The "German incident" wasn't really the reason for the drop down from 70k to 53ish. At least the "government coins" sales themselves didn't impact much in price. I have followed the drop and it was mainly caused by panicking after the announcements of the LKA ("Germany") and Mt.Gox. When the LKA finally dumped their coins (mostly OTC) the price rose again
But a few millions would be a completely different story than 50000 or 150000 coins.
The fact is what really can anyone do???
Actually a lot. Why are politicians like Kennedy proposing these things? Because they know that some Bitcoin speculators like the idea, so they can dump their coins once the "government pump" took the price to extreme heights.
So what you can do is to not vote people who propose that, and clearly signalise that many Bitcoiners aren't interested in a government-controlled Bitcoin.
Of course in countries like China this isn't possible that easy. But even there, you can raise your voice to some extent.
[...] did you even bother a bit to ask yourself, what it will take to buy up to 2 million or more bitcoin from the open market? Even buying 50,000 bitcoin can drive the price of bitcoin up high to the roof, not to talk of buying up to 1 or 2 million bitcoins, [...] it's not really all that easy for any individual or governments to own up to 2 million bitcoins without them emptying their reserve or treasury.
I'm not so sure about that. If a government does it well and uses OTC and limit orders intelligently, it could buy several hundreds of thousands slowly without moving the price much. The Bitcoin trading volume on the main markets (see Coingecko for example) is currently of several hundreds of thousands per day. So for example if you buy 1000
BTC a day (365k a year), you barely move the market. You can always wait for the price to dip a bit and then buy, nobody forces you to do market orders. You can even buy your coins during the next bear market. And of course your authorities would continuously seize coins from criminal proceedings so you can acquire coins "for free" without having even to touch the market for that.
The other way around unfortunately that's not that clear. If the goal of a "FATF coalition" is to impose a censorship mechanism, they would probably sell fast and not care much about how much they move the price.
Even if we all agree with you that governments should not store millions of BTC, who is going to stop them if they want to, the BTC network is decentralized and censorship resistant, so anyone and any institution is free to accumulate as they like.
See my answer to Mia Chloe above.
However, i don't think BTC will be popular amongst countries, neither will they desire to have BTC in millions as part of their reserves, most of what is said in the U.S these days is just campaign strategy.
It's likely you're right here, and I hope it. For example, the strategy to accumulate only seized coins is still ok for me, it would probably lead to US holdings of half a million in 10 years or so, which is still not critical.
So if we hypothetically agree that different governments accumulate this much, it would still be almost impossible for all of them to collaborate to 'hurt' the network, they don't collaborate on so many things, so why this?
Areas like the combat of money laundering are where they cooperate a lot. Even a "libertarian" government like Argentina was eager to implement the latest FATF recommendations, imposing tight regulations for crypto service providers.