A conscious objector for the necromancers. I guess I would to see a more nuanced 'evil' society - as Echo has mentioned, healing is - in itself - a utilitarian magic effect. What makes it 'good' is how its used. Used on the lesser people, the unworthy, the useless - that is what makes healing good.
On the other side, it somewhat trivializes how evil real necromancy would be - imagine having your spirit having hurdled the gates of St. Peters suddenly clawed back into your old, damaged, rotted shell? Or deliberately pulling power from the realms of hell filled with beings that make serial killers quake in fear?
I could imagine someone with 'weakness' of spirit would have a hard time hiding that from the beings of the netherworld that this magic forces them to deal with. You would a spine of steel to somehow do that without falling into madness.