Coelcanth: I don't need to ask them, it was already asked, they are free to communicate with the living, if their actions are considered meritory by God, their spirit will get closer to Him, in spiritism we belive there's 9 levels of spirits being God lvl 0, the lowest spirit lvl is 9, in opposition to "revealed" religions we don't belive in evil but in irresponsability, a good example would be: If a litle child breaks a glass, is she evil? The answer would be NO, she broke it because she hasn't leurn not to do it or how to prevent, in the same way, a spirit may do "evil" actions, not because he's evil but because he hasn't leurned yet that he shouldn't do it.
Spirits will be constantly reencarnated in physical bodies to test them and allow them to get experience and in the futuer be able to help God on his several tasks.
If you wanna know more, i advise you reading "The Book of Spirits", and no, it isn't an "Holly Book" but just a book that contains all the concepts on spiritism, if you find anything that may confuse you, feal free to ask, ;)

Only God Can Judge Me
الله فقط يمكنه محاكمتي

I am you and you are me, if you love i love, if you suffer i suffer
أنا أنت, و أنت أنا, إذا أحببت نفسك أحببت نفسي, إذا عانيتَ عانيتُ