Originally Posted by
InvisibleBison
Objections to creating undead tend to come in four general categories, not all of which may apply in a given setting:
1) Creating an undead from a body harms the body's soul in some way.
2) Necromancers are incentivized to kill people in order to have bodies to use.
3) Undead, when not properly controlled by a necromancer, will attack the living.
4) Undead are gross.
In the scenario you're describing, 1 is not the case. 2 can be avoided by using trustworthy necromancers and/or keeping a close eye on the necromancers. 4 is not such an issue in a desperate situation. The only problem I see is 3 - what happens if the necromancer is killed or loses control of her zombies? Of course, that's less of a moral issue and more of a practical one.