Fair game is a concept in Scientology that means you can do whatever you want to someone who is considered your enemy or someone who speaks out against Scientology. Basically, it means that you can treat them unfairly and do anything to them, without feeling bad about it.
This is a very bad thing because it's not nice to treat people badly just because they disagree with you. It goes against the idea of treating others how you want to be treated, which is something we learn as kids.
No one should be treated unfairly just because they have a different opinion or belief. It's important to listen to other people's perspectives and opinions and to be kind and respectful to them, even if you disagree with them.
In summary, fair game is a bad concept that promotes treating people unfairly and disrespectfully just because you see them as your enemy or opponent. It's important to treat others kindly and with respect, even if you disagree with them.