Andagor
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Here's what I think about the ultimate goal of the Necromancers:
They serve the goddess of death, Askha. And she, in turn, uses everything for good because she doesn't perceive time. She doesn't strive, in any case, to kill anyone for evil... they simply understand that everyone will eventually face the Lady Ashka. This reminds me a lot of the followers of Lim-Kargma from R. Feist's books. They serve death and don't bother anyone. But, of course, they destroy obstacles. Moreover, necromancers know a ritual that sends a person painlessly directly to the goddess of death. That's it.