Satsuki Kiryuin

Because they kill them with the set thought that it will always go bad. So i can understand why you haven't seen any.

Then can You tell me an example of such topic?

Here's an example:

Someone was wondering about peoples thought on the comparison from clopping to masturbating pornography, and it was a legitimate question the user asked. He get's his first response, saying that people have their own interest in what they masturbate to and doesn't judge them. Then you have at least one person that will always say it's vile and disgusting, like it's cancer to do it. Then that's when they lock them.