It isn't a bug. It's made that way because necromancers have no real other way to shine, as unless they play clerics most will never be able to cast the spell itself! They also take up a lot of points because animation is not exactly a simple art!
If you want to be able to animate like a pro, take caster levels and spell focus: Necromancy.
If you want to be able to animate like a pro, take caster levels and spell focus: Necromancy.