Distributed mining is the defense against attack.
Which implies that it needs a defense. Sans that it can be brought down. Governments can ban GPUs, mining rigs etc. so the defense gets weak while they can have powerful hardware.
What does the technology have to prevent such a thing from occurring?
Bitch please, ban computer parts?
They don't need to make a PC revolution to make a 51% attack, they have lots of super-computers to make a lot of floating points operations that, if they want it today, they can make the 51% attack.
Not really.
There are super computers, but generally they are already committed to tasks other than fucking with bitcoins and floating point operations also don't have much to do with SHA-2 hashing. There isn't a
single supercomputer that could 51% the bitcoin network on its own. Traditional and even newer GPGPU supercomputers are actually a really shitty way to attempt a 51% attack.
Of course there isn't a single computer that could do the job. I said about he floating point operations because the main operation of a common GPU are floating point operations, since in our fake 3D games there are no integer numbers.
I know that every single supercomputer of a government already have a task, I'm just saying that they have enough power to easily make a 51% attack, but, why in the hell they would make it? BTC network is weak and they dont care about BTC, today.