Knifes are meant to cut things like bread in reallife, not to stick them into your neighbours pets. While i think everyone has responsibilities, you can't stop people from cheating if they want it. What do you expect knife manufacturers to do, include a self-destruct mechanism into their knifes that detects when someone uses it for the wrong purpose? Or let's take cars for example, they should bring you from A to B, they aren't meant to be weapons to run over stuff. I think the reason why it may work for both simply is because how the game and the mechanics work, since Singleplayer also is some kind of "online". The only possible thing would be not releasing any trainer for this game again in the future then.