It doesn't matter if the US government is doing the attacking, they're not winning with general purpose hardware. ASICs are literally thousands of times faster

It doesn't matter if the US government is doing the attacking, they're not winning with general purpose hardware. ASICs are literally thousands of times faster with lower power consumption than GPUs. Also, any state attacker worth their shit would have the ability to develop their own ASICs so I don't know why you're hung up on using general purpose hardware. Finally, you certainly cannot buy off the ASIC miners with a few million, not least because they own billions of dollars worth of ASICS that can't do anything but mine Bitcoin, and a successful state-orchestrated attack on Bitcoin would make all of them worthless. I don't think a state government taking down Bitcoin by its own rules is completely impossible, but you don't seem to have any grasp of the scales involved.