Cheating & brainwashing are a violation of our normal society ... taking away one's rights & privileges against the will of someone else.
In a "reality world" we should approach our desires in a fair way that represents both parties involved. But, in the internet world, we don't live in a "reality" world, we live in a "virtual world", so what you read & see on the internet doesn't necessarily make it true.
So, although cheating & brainwashing may be important to the one wishing to accomplish their own goal & desire, it's not FAIR to the ones you cheat ON or try to BRAINWASH to do things against their normal desires.