@danvolodar
Again, not saying that the Pointed Hat faction is good, just breaking out the reason that they specifically forbid the study of healing magic, because many readers seem to have difficulty understanding why healing magic is a problem for the Pointed Hat faction. And you also failed to see my conclusion:
The problem with healing magic has very little to do with healing magic. It's that once healing magic is out there in the wild, it makes all these other things uncontrollable.
If the problem were lethality, they would only
allow healing magic, and forbid
everything else. So clearly the problem isn't lethality, the problem is access. Obviously, there's a reason they want to maintain access to all the lethal forms of magic: because there's way more lethal magic users than there are healing magic users! The majority of mages want to keep access to as many other disciplines as possible, so they suppress the small group whose discipline they have a problem with - healing magic.
Again, healing magic is the
only discipline that specifically turns all
other lethal magic into torture, and turns magical law enforcement into a magical arms/healing race.
Without healing magic, other lethal magic is just murder. And ordinary witches stop using magic on other people because
murder gets them into trouble - it's much harder to cover up those disappearances, and eventually villagers will come with pitchforks, nobles will come with armies, and other moralistic witches will come to do battle. Sort of like guns - ordinary people try not to use guns because we assume that guns are lethal, and the outcome of using them is just murder, and murder gets us into trouble.
But with healing magic in the wild, all this lethal magic is "solveable". And ordinary witches can use their lethal magic on other people all they want, because healing magic can "fix" their abuses, mistakes, and tortures. There is no "anti-gun" that "solves" for the lethality of guns in the real world. But if there were items like personal kinetic shields that appear in Dune, or healing patches we could stick over a bullet hole, then ordinary people might start to use guns more freely, because those things "fix" the lethality of guns.