I think bigfoot has built in protection within our own minds. Hear me out........Most people don't believe they even exist, so the witnesses don't get taken seriously even when there may be physical evidence. When there is evidence, it either tests out human or some other known animal and if they are human, they are protected already, ........if not through the law, then with secrecy or both.
I don't believe they could exist today without recognition if the above wasn't the truth.
Habitat? Well, who say's it's not protected and managed for a plethera of other reasons already?
I'm not anit-proof, I just think it should be done in a non-destructive manner because I think they are closer to us than what most scientists would wish to debate over when it comes to classification and ultimately determining their rights as beings. persons and or a separate species.