If what you wrote were logical, then decentralization would always be the same as centralization.

Decentralization is where the decision making power is spread out to as many actors as possible. A few miners in China making the decisions for all the users of Bitcoin, is not decentralization. You are conceptually conflating the sham of representative democracy (or in this case taxation without representation because we don't even get the illusion of voting) with decentralization.