Why do so many of the truth claims emanating from The Spirits’ Book of Allan Kardec and the GetWisdom pantheon from Karl Mollison hang on the primary truth claim of reincarnation?

The reason is quite simple, it is the central mechanism propelling the soul forward and allowing a sojourn in the physical realm which is not natural to its native existence. It is, by definition, an environment with limitation built in, and this will limit lifespan and introduce other constraints as well. In actuality, for purposes of testing free will and what people end up doing with it, the physical paradigm of reincarnation in life after life provides a quite rigorous testing ground for the degree of learning and sophistication that has been acquired, and most importantly, the ability to stay in divine alignment while surmounting great challenges and difficulties that arise from the fragile nature of the human being from inhabiting a physical body with limited lifespan. So this at once provides a foundation and a springboard for learning and growth. It is also an important aspect of unraveling the mysteries of life, as you are experiencing it from a physical vantage point, and a clue as well to the various ways you are being manipulated and your life experience limited and worsened through deliberate mischief. All of the negativity experienced by human beings arises because of hidden influences, at least in their origins, and this adds to the difficulty in sorting out and overcoming the problem of evil that has arisen within the galaxy you inhabit, and affected the living beings therein to be untrustworthy and dangerous to be around. Much of the challenge of evil you were designed to address is important because it limits your very term in existence as a physical human being, because it will shorten the lifespan many times, and even cause death outright when someone is corrupted to take the lives of others or people are manipulated to engage in acts of war. So understanding the very paradigm of life, transition back into spirit form, and reemergence one day in a new lifetime, and its purpose, to provide a continuum of learning and growth intended to build towards something, is all about the goals we have in creating you and what you must do to be successful in bringing about our vision for the future of the divine human and the future of your galaxy and the universe as a whole. The carryover of not only physical characteristics, personality traits, and so on, from a genetic heritage is a minor element compared to the karmic imperatives your time in the physical generates each and every day with both good and especially, bad experiences whose negativity projects into the future just like the positive will. But instead of bringing back rewards and blessings, it will return to you the unfinished business of being wounded in the past or wounding others, and find a way to make you pay attention and rebalance the negative energy in some fashion, and it might be through punishing you or causing a physical illness of some kind as a repayment, all of which limitations are teaching about life and the broader meanings and obligations you have as a soul-based being. When much of that negativity is coming from other races of beings manipulating you to cause harm, the challenge escalates from not only finding out a way to heal and save yourself but to heal and save, in addition to the whole of the human race, multiple races of other beings—spirit-based and extraterrestrial races in the physical who are not using their incarnations wisely and interfering with yours.