Revenge. Maybe the family has some connection to a past event where the necromancer was wronged. For example, if the family was part of a group that once tried to destroy the necromancer's book or stop their necromantic practices, they would seek revenge.
Yes. In many such science fiction concepts, a necromancer might be driven by dark powers or motives and could end up killing a family, perhaps to gain some power from their deaths or to further a sinister plan related to the book they are associated with.
One possible reason could be that he doesn't like the way science fiction often involves a lot of special effects. He might prefer more dialogue - driven or character - based works.
Well, many science fiction books have really engaging characters and plots. Take 'The Hitchhiker's Guide to the Galaxy' for instance. The characters are so quirky and the adventures they go on are just so much fun to follow.
In the official 'Naruto' series, Naruto would never kill his family. However, in some extremely dark and non - canon fanfictions, such fanfictions might exist just for the shock value or to explore extreme 'what - if' scenarios. But this goes completely against the essence of Naruto's character, who values family and friends deeply.
It could be because of a dark curse. Suppose Naruto was cursed by an ancient evil. This curse slowly ate away at his sanity and made him view his friends in Team 7 as threats. As the curse took over more and more, he finally reached a point where he killed them. However, this would require a lot of backstory and character development in the fanfiction to make it somewhat believable.
One reason could be Sasuke's thirst for power. If he believes Naruto is the only obstacle in his path to ultimate power, he might be driven to kill him. In some fanfictions, Sasuke may be influenced by a dark entity that twists his mind into thinking Naruto is a threat that needs to be eliminated.
Perhaps he is under the influence of dark magic. There could be a spell or a curse that makes him lose his will to live. Or, in the fanfiction world, he might be bullied or persecuted to an extent that he sees no way out but to end his own life.
Maybe in a fanfiction where Kakashi is mind - controlled. It could lead him to harm Naruto without his normal self - control.
It might be for the greater good. If Obito's actions in the fanfic are leading to destruction on a large scale, Konan, being a protector of sorts, decides to take him out to save the world or at least her part of it.
Maybe in this fanfiction she experiences a great loss, like the death of a loved one in a very tragic way. For example, if Ron or Harry were killed in a battle and she blamed herself for not being able to prevent it. This overwhelming guilt could be a reason for her to try to kill herself.