Depends on the source material. More often than not fiction depicts necromancy as evil aligned due to the baggage the walking dead carry with them. Even at its most benign, the act of making the dead leave their tombs is likely to at least be seen as roughly analogous to desecrating a corpse, disrespecting the dead, and/or grave robbing, if not the absolute worst kind of slavery (compelling obedience via suppressing the soul)...and of course the near constant invocation of necromancy as a practical synonym with 'black magic' doesn't do it any favors either. Suffice to say that it's an easy 'obviously evil' target, and off the top of my head I can think of only a few examples which present it as benign...with a possible exception of séances, which have more in common with 'classic' necromancy than the Hollywood portrayal of necromancy does (which is to say: classic necromancy is temporarily calling upon dead spirits for divination purposes)...and even then it's presented at least as often as not as near Faustian in recklessness.