Its rather that once something like this comes out, the whole community will know. There's also a potential that children could access whatever pornography is being advertised. I don't think its contradictory - once its public knowledge, it becomes potentially or actually harmful.

Further, I do think that what people do has the potential to affect their mind - how they see things and behave. This is true of soldiers, or abbatoir workers, for example.

Apologies for making you angry, it wasn't intentional.