But there are more senses than sight that a creature could utilize to detect humans. At a mile away? Sounds like a good sense of smell.
Define "inferior".
Just because I can beat a cougar in a spelling bee doesn't mean that he isn't a ghost in the woods.
I do not accept the premise that Bigfoot can read your mind and either choose to reveal themselves or not based on your intentions.
We have members of project Grendel with sightings under their belts. And proof? How is that working for any of us? I don't really see the need to alienate any one group pro kill or not.