Developing a cheat does not ruin anyone's fun. The same goes for guns, knives, anything that could be used as a weapon. It's all about how you use a tool, and in this case creating the tool is fun. Unless you think that everyone who fires a gun for fun, or creates a knife or even just a baseball bat, is a murderer?

You're telling me there are people who develop cheats only to not use them in public games, and not distribute them to others?

No idea what other people do, you'd have to ask them.

Seems like they all develop cheats to cheat