I'm arguing that it is in one's interest to not hold naive ideals about the world, about reality. Reality is a dirty, ruthless place. If you don't conduct yourself being aware that other people are going to take advantage of you, or even cheat on you, then you will end up getting screwed because you cannot defend against attacks you aren't aware of nor expect.
If you made your statement that "the world is a dirty place" I think most would agree with you. The point almost every reply is taking issue with is when you say "cheating is legitimate".
The replies, including my own, are saying "cheating is not acceptable". By originally saying "cheating is legitimate" you are saying "cheating is acceptable", but in your follow up arguments it's "cheating moves that are not caught are considered legitimate", which is the definition of legitimate and thusly there's no substance.
