LOL, that old man really fooled alot of people. Good for him for creating what would be perhaps the best, most well known, physical proof and evidence in Big Foot (a.k.a- Sasquatch, Yeti, Abomidable Snowman).
As for my belief in the creature(s), I believe that if they do exist they must be the missing link. An evolved form of man whose evolution cycle stopped midway or at an early stage. It wouldn't be impossible to explain how such creatures survived. In fact, if there are such creatures, there are lots of ways you could explain them being able to survive for long.
I believe more in E.B.Es (Extraterestrial Biology Entity) (aliens). There is far more substansial evidence, personal accounts of people all around the world saying very similar things, and in different tongues (proving that in most cases its not just a mass conspiracy like crop circles can be), heresay and rumors revolving around them. I even know people who say they've seen real aliens upclose and even communicated with them. These are people I know have nothing to gain from lying and wouldn't lie to me. There are times in my youth and even recently as much as a few years back that I've that perhaps I've had something to do with paranormal activity myself, whether thats aliens or something else like spirits, demons, or 'ghosts'.
As for Big Foot, sure, I'd think I'd go along with believing it. It makes more sense than alot of the other creatures of myth.
Interesting topic. Thanks for bringing it up.