For me the one of the problems of re-incarnation is, aside from its more horrible implications of belief in karma, is that it only allows for reincarnation of humans. I think that the human is an animal as other animals. We are weak compared to others, smaller and less able to defend ourselves and so we have developed our intelligence to allow us to survive. Since we differ in only minor ways from other animals should not they be able to reincarnate? Or do believers of this idea think that the ability to live again lies in the 2% of our genetic heritage that we do not share with the apes?

A second problem is that, like a voice from the afterlife, there is absolutely no credible evidence that either has ever happened, ever, anywhere!