If I discuss ideas between me and another person society does not benefit; only the two benefit.

If I subscribe to a magazine and journal, only I benefit.

So, why should the people who don't use mail pay for the people who do use mail?

> but is still the one with the least capability of censorship (yes, it can be done, as Communist and Fascist dictorships did, but it requires massive manual effort).

Why do you think it has the least capability of censorship, especially versus the internet?