How about that you are both wrong?
I've been hearing this argument for a long time.
"If a government or a big financial corp wanted to destroy bitcoin, they'd just buy a lot of mining equipment".
I believe first time I read it, it was gmaxwell calculated how cheap it would be to conduct 51% attack... it was ages ago.
Well, then my question is: why haven't they destroyed bitcoin yet, this way?
You really think they would not want to?
They failed to destroy Bitcoin because it is not only about buying mining hardware, just like wining a war is not just about buying weapons.
There is a shit loads of logistics involved with using these weapons while there is a lot of human factor involved and the situation on the battle field is changing constantly.
The governments and the big corps are too slow to follow this battle.
They don't have an organisation in place that could handle manufacturing and deploying mining equipment quickly enough and then maintaining it (undisturbed) for long enough. And they have too much corruption inside.
The only way it can work now is because it is distributed and each mining operation is independent.
Some of them are actually secret.
For the big organisations that would want to get rid of bitcoin, it is much easier to corrupt people and conduct propaganda campaigns in the media.
And that's what they do.
Mining is the most important (and the most resilient) point of resistance of Bitcoin, against the governments and the financial oligarchy.