only 10% of Tor users are journalists, human rights activists, etc. A bit more than half use it to hide illegal activities.
(Yes, TFA is about messaging, but the whole "we must save encryption to protect the downtrodden" meme is just bogus.)
You got it backwards. To make your point about bogus, you should look at the percentage of journalists, human rights activists, etc. being Tor users, not the other way round.