How can the gospel tell you to neither take action into your own hands
Loving your enemies must not be merely a passive emotion. It is action.
nor hope that God will right the wrong?
Hope that God will right the wrong, not that he will harm evil-doers in vengeance.
Christian tradition and its assignment of numerous individuals to hell.
Are you talking about pornographic stories of "visions" where the propagandist sees Severus of Antioch or Nestorius in hell?
That's not the Christian tradition.
"Some Greeks did it in medieval times" is not Patristic tradition.
If someone poisoned Arius that was not the Patristic tradition.
"Someone stuck so-and-so's name on an erotic story about visions of hell' is not Patristic tradition. It's stuff that was going on in Patristic times, but during medieval times Bogomils were living in Constantinople, Arians in Rome, mobsters in Alexandria and Nestorians in Arabia. Antiquitas sine veritate vetustas erroris est.