"Bigfoot"; expanding the parameters

     Becoming acquainted with the most well known, mainstream, "Bigfoot" researchers, I note the parameters they set on qualifying it's existence. Three of the main parameters is 1)primate diet (seeking evidence of/validating proof of existence on 'scat') , 2) mating, 3) corpses. Knowing what I know about them and working 'backwards' to offer valid reason to expand those parameters, I offer the following:
   If that which most call "Bigfoot", Sasquatch, etc is a subspecies primate, similar to humans, and thus comparable to humans, I am aware of some comparisons that may be being overlooked or simply less commonly known.

    1) It is purported that "Bigfoot" is older than humans; called "Elder brother" by Natives. Some are reputed to be peaceful and guardians in nature, others aggressive. In the human species, the most peaceful are "breatharians". They do not eat or drink anything. They, therefore, do not eliminate (produce feces/scat). They leave no "evidence" of their existence in that way.  What would cause members of a normally peaceful species to become aggressive? In certain animal species "rabies" exists without causing illness, being contagious or being infectious. However, sudden disruptions in their environment like blasting trigger an imbalance in the body's chemistry causing a normally passive aspect to become a disease which causes aggression. It works the same way in human beings: certain bacteria are normal in the body, but out of balance something like candida becomes a "yeast infection". "Bigfoot", as "guardians" would be in areas with plentiful food and water because that is where those they are looking after are: the greatest number of animals......and humans. If "out of balance", aggressive and meat-eating, they very well could have been affected by a sudden strong disruption to their individual environment.
   2) It has been found scientifically that animals that are not experiencing threats to their existence reproduce less frequently. Fear triggers a change in the focus of the body's energy to reproduction rather than evolution. If "Bigfoot" experiences far less fear than the average human being, it's urge to reproduce would not be comparable and thus mating not a priority occurring nearly as frequently as one might otherwise believe.
   3) Scientists have discovered that human beings have the capacity to live much longer than they do. They have found that the question is why human beings die at all. They associate death with an addition of "junk" to the DNA of human beings, that if could be removed, would allow the more natural state of "immortality" to exist for humans. "Breatharians" and many very peaceful human beings in less threatening environments live much longer lives than the average human."Bigfoot", being another species of primate, could very well be "immortal" or at the very least, much longer living. If this is so, there wouldn't really be many corpses TO find.

      If these comparisons be valid, then more expanded parameters for proof of "Bigfoot's" existence would be more appropriate. With a more open parameter of expectation, one could get a more clear grasp on the "vibe"/picture of "Bigfoot" to zoom in on, increasing the chances of drawing them in closer. Furthermore, if they are highly sensitive creatures, an aversion to humans and the ability to sense their nearness (thus avoid them more easily) could be understood if compared to human beings who experience a greater sensitivity called "empathy" and are referred to as "empaths" or "empathic". A bit of research on the human version may give insight on the "Bigfoot" sensitivities to being close to human beings.

   It certainly syncs up greater with my experience of "Bigfoot" which I call "The Pure People".