That is the authorities business. When someone in the street is speaking aloud, then you can't go to them and demand them to reveal their name, even if what is

That is the authorities business. When someone in the street is speaking aloud, then you can't go to them and demand them to reveal their name, even if what is spoken is against the law. You can call the police and they can determine the name of the speaker. The internet is not a lawless place.