So in other words, you want the US to use taxpayer money to buy enough Bitcoin in order to manipulate the price of Bitcoin--in the same way the US has a strategic reserve of oil that they sell off when the price of gas gets too high.
A strategic reserve would give the US government the power to determine the price of Bitcoin. They could make the price go up by buying it, and make the price go down by selling it.
That's what you want? Seriously? Are you mad?
Well unlike the oil, bitcoin is limited in supply and everyone is open to benefit from whatever you think the US government might be doing to manipulate the price of bitcoin in the future. The level of monopoly they have in the oil sector, they can't have that in bitcoin. By the way the US government won't be the first or last to try to manipulate the price of bitcoin. Many organisations and people have tried that in the past, yet bitcoin has managed to keep making new ATH. So even if they choose to be selling when the price of bitcoin is high, that alone can't determine that US government will have control over the price of bitcoin.