Accessing a secured system without authorization is a crime at the federal level, typically investigated by the FBI (bearing in mind that they will prioritize cases, and game hacks would be toward the bottom of that list).

To the OP, there certainly is a temptation, but you speak as if this precludes people from exorcising judgement, and acting in a way contrary to their initial impulse. I would agree that there are many people in the world who lack the intelligence/judgement/etc to act in a consistent and morale manner, but I also don't think humans are incapable of acting in any other way.

The issue is also confused by systems which can isolate people and obscure the true outcomes of their actions. History is littered with examples of people who felt at the time they were doing the right thing, but to paraphrase, the road to hell can be paved with good intentions.