People see Bigfoot and have done for the whole time they have been in those areas.
People have seen wildmen or beastmen in every inhabited continent through every epoch of history.
People see and have seen Bigfoot.
There is a reason people have not been able to produce scientific, irrefutable evidence. There is a reason for this. I would point you towards Patrick Harpur's book, "Daemonic Reality".
I believe Bigfoot, or the wildman, to be very much about us and our relationship with wild places. Manifestations of our ancient, genetic fears of such places. And I do not mean solely spiritual manifestations. These things snap trees and throw stones. They are more than a memory. They exist.
But in what way do they "exist"? In what way does anything "exist". Can there be different types of existence? I think so. Ghosts exist...people see them and have always seen them. Can science prove or disprove their "existence"? Not a chance.
"There are more things in heaven and earth, Horatio,
Than are dreamt of in your philosophy. "
- Hamlet (1.5.167-8), Hamlet to Horatio
So, you cannot deny Bigfoot exists....the question is how it exists. Maybe even why it exists. I suspect without people in those woods there wouldn't be any Bigfoot out there either. Symbiotic relationship. Bigfoot is about us, and about the wildness we can visit but never be part of. There is a reason that every culture, in every country has a long history of wildmen. Because they exist, as we do. And because of us. And there is a reason nobody has ever served up a body to science. And never will.