I think that past the ghost stage and moving on over that, there isn't another life, thats why people who aren't religious are so scared, because there isn't anything to fall back on or to save them.
If you kill a human, your not just killing them, your killing everything that they could ever become, your killing their personalities, your killing their minds, souls.
So, as such I don't think I'd have an issue with it, as it doesn't really exist past the ghost stage, and if your issues go unresolved then you'll forever be a ghost. Wandering around, being able to see your loved ones but not being able to have real, physical communication with them if they still live in the same house..