There are quite a few centralized coins out there
For example, Ripple or Ethereum (and even Litecoin, to a certain degree, via Charlie Lee intervention), and the "controllers" have been exerting their power on a pretty regular basis. The famous Ethereum rollback is just one glaring example of that. But as I said it already, people won't care as long as the price will be rising. If it won't be rising, they won't care either whether this power is in fact NOT exerted at all. As no less famous saying goes, profits always trump prophets
to an extent that centralisation is actually appealing to the people who are into those coins. they've made no secret of it and enough people have accepted it
You have to face the facts
Even the facts which you don't quite like. After the Ethereum rollback happened, only a small part of the Ethereum community decided that it had been a bad idea, so they chose to fork off. Right now this fork is dragging a miserable existence, and as I can judge it would fare much worse if it were made up exclusively of people who care for some "principles". Conversely, it might well be the case that it didn't die out completely only because of the people who don't care about anything but profits (read die-hard speculators). This seems to be the harsh truth you might have to accept