You need to learn a little more of the concept of what a hard fork is. If 'one guy' attempted a hard fork and the rest of the coin's community did not accept it, do you know what happens? Nothing. No fork takes place.

We have been told why a fork needs to occur, but it requires the majority to accept it. So, no, it is not 'one guy' performing a hard fork, it is the community.

Decentralised.

Check-and-mate, ignoramus.