Then the must face whatever punishment that society deems suitable for them if they are a part of it. It may seem unfair to that person, but it is considered to be for the greater good of people.
Okay, so our society here has decided that people who espouse your view need to immediately commit suicide or be killed by torturous methods that take days. It's the law.
Now follow the law.
See, that's fucked up isn't it?