Shallow of me perhaps--but if the Dalai Lama doesn't have a problem with it (and he is one well educated monk), why should I? Strange thing though, I'm one of the very few people who actually have memories of prior incarnations--or, I should say more precisely, I have memories of the deaths (the dying moments) of a couple of previous incarnations, with just enough recollected background information about each of those lives to make sense of what they were going through, and what they were thinking about (and anguishing about) whilst they expired: How they both, though very different entities (one a young woman, the other a middle aged man), pitied themselves and blamed others for the circumstances that had led to their deaths: Very edifying, and not in the least flattering to me, or aggrandizing; so I suppose that I may, without the least suspicion of vainglory, consider them to be valid memories. But there's hardly enough in my memory-base to visualize or erect a whole schematic theory of reincarnation, as apparently the Buddha did from his own self-recollection. If that's how the Enlightened One saw things, well, all right--but, apart from making sure that I don't fall into that old trap again (of pitying myself and blaming others), I really have not much use for the theory of reincarnation as such.
Regarding Karma and the Divine Order of Things, honestly, I have no direct perception of either of these supposed Universals, but I believe in Karma for the same reason that I believe in my own conscience, because it makes me happy and puts me at peace with my own existence to do so, and because I would be wretchedly unhappy not to believe in it. But, if you please, I am an Occidental Man, with a "naturally" vastly hypertrophied sense of Individual Self--illusory as I know it to be--which is the ineluctable conscious legacy of three millennia of wide-awake, noon-day civilization, and, with David Hume at my elbow (and the Treatise on Human Understanding at the back of my mind), it is simply impossible for me to believe in cause-and-effect, or Divine Purpose. Sorry.