I will only answer your math argument because the discourse is getting convoluted.
What you have is a good point.
Now imagine that, like the whale, retails are also smart and already KNOW that when a pool is 50% whale, that pool is CENTRALIZED and that their vote is irrelevant. So, they find someplace else that is more DECENTRALIZED. That leaves the pool where the whale is with lower vote count than he expected. There is a dynamic here - a game theory - just like how the consensus mechanism (although flawed) was designed. In a popular vote, your power is only dependent on how much ADA you hold. Nothing else.
Now we can argue that retail, being a representative of a population, only really have an average IQ which brings me to my other idea (read it here) that pool reward, block production, and now voting power, should be proportional to how decentralized the pool is.