As for the argument that Necormancers are inherently evil...no. Just, no.
And I quote, from the PHB:
"Most people see necramancers as menacing, or even villainous, due to the dose association with death. Not all necramancers are evil, but the forces they manipulate are considered taboo by many societies."
Read the description of Animate Dead. Want to know what it DOESN'T say? That the spell is inherently evil. Just like the Conjuration spells don't do that either. So no, Necromancy isn't by definition Evil, and it is perfectly allowable by AL rules.
Hell, you might have motivated me to make a Necromancer just for the new season.
PGB Page 203 "Schools of Magic"
"Creating the undead through the use of necromancy spells such as animate dead is not a good act, and only evil casters use such spells frequently."
That being said, I play a good RP Necromancer bard. The madness of the demons twisted his Revivify spell into Animate Dead when he casted it.