Some Governments are biased, and if they get hold of the control of Bitcoin, no one could predict what could happen. Moreover, the essence of Crypto-currency is not to place the control in the hands of some people. Crypto-currency is a default trust system, and when people gets to control it. Biasness could crept in, not to talk of when Government gets in charge.
Although, there are good sides to it.
I agree with this, while some people complain about the whales having a big influence in the market at the same time they have gained the right to that influence by having so many bitcoins that they earn by being smart and invest at the right time unlike so many other people, but in a centralized system those very same whales will be a lot more powerful since they will be able to bribe those at the top and play by different rules than the ones that we play.
Under a decentralized system whales still have a lot of advantage since they are very powerful but they still need to play by the same rules that we play, that means that if they make too many mistakes they will stop being whales and they will not have as many influence in the market as they have now.