Necromancy can be done with consent (before AND after death) while a swath of enchantment is explicitly non-consensual.
Necromancers in my D&D setting are some of the most trusted mages in the land, as they provide essential services such as allowing people to speak with their fallen loved ones, investigating crimes, and get very angry when people abuse those gifts. It helps that their patron deity is the Young Goddess, a CG deity of exploration, curiosity, knowledge, and aid.
One of the already-revealed major villains of the campaign is Bertrum (they never found his body), a sociopathic Enchanter who nearly succeeded in charming the city council into killing each other.