Since 50-60 miners control 51% of the computing power and since it is not possible to know who they are, one must trust that they are not either some private company or some government. The principles of decentralisation transparency of the whitepaper fail.
I'm not disputing that possibility. However, the so called transparency that you have mentioned in the whitepaper doesn't support your point. You can see everything is on the blockchain, but you cannot see which entity owns how many Bitcoins. Same principle applies to mining, which isn't highlighted in the whitepaper.
I find the entire discussion to be centered around hypothetical scenarios, which is rather unfortunate. I would expect more concrete points to support arguments rather than have the points revolving around the same few hypothetical scenarios.