Where are the therians who don’t believe in reincarnation or are indifferent about the cause of their therianthropy and are totally fine with that????????
Reincarnation is a valid theory and the best one I have heard so far, if we have spent different lifetimes as different things, it would make sense that our spirits would retain a sense of them between lives, and also draw a certain bias towards the type of animal that worked best for that spirit, or has been the majority of incarnations.
However that does not mean that other explanations and theories are not valid either. I believe in my case I am both spiritual and mental/psychological therian, I believe one causes the other.