>or teaches the duty, necessity, desirability, or propriety of overthrowing or destroying the government of the United States
Didn't both Corney and Brerman make tweets about people in their orgs still 'doing their duty?' not too long after Comey was fired?
All you had to do was follow the damn train, CJ.
>At what point is subversion and treason responded to and handled?
As distasteful as the answer may sound, when the public is able to accept that it happened. As a politician you can't just go around arresting journalists for "lying," even if it's actually true that they lied, because you need the will of the people on your side for what comes after that. Journalists are seen by the public at large as the ones who keep politicians in check. If you arrest a journalist and the people don't like you (or at least like the journalist more) then you're the bad guy, the enemy, even if you're morally and legally in the right. If the public becomes upset that the journalist lied, however, then you're the good guy delivering proper justice. Will of the people is incredibly important, and the one thing they absolutely fear.
tl;dr
The wheels of justice grind slow but incredibly fine. Also, patience is a virtue.