There is a general saying that comes to my mind when I read this. Power corrupts and absolute power corrupts absolutely. I really picture how powerful tech giants' CEOs like Facebook and Google feel having access to all that info and data, carefully collected from all around the world. And as we all well know, knowledge is power. The same goes for the leaders of the financial systems. Having all that control over funds and knowing so much about all the transactions that go on around the world. One would certainly get tempted someday. And this is where decentralization comes in handy; to relieve them of that burden.