I'm personally rather fond of 'where's the reliable evidence?'.
Let's try some variations:
Where's the DNA that we should be finding associated with 'nests'?
Where's the reliable evidence that one should expect to find for an animal reported from Alaska to Iowa to Florida?
Where's the discernable affect that such a creature should be having in it's environment?
Where's the reliable evidence that one would expect to find for a creature that seems to inhabit basically any areas with sufficient cover?
Where's the fossil record of a bigfoot-type creature anywhere in NA?
Where's the increase in track finds that we should be seeing comensurate with the increase of active searching for this pan-continental beast?
Where's the increase of quality images we should be seeing comensurate with the increase of active searching for this pan-continental beast?
Where's the reliable evidence that should be forthcoming comensurate with this pan-continental beast's reduction of habitat?
I'll respond to Belz's and kitakaze's posts later. I'm on my lunch break right now.
Hopefully, the 'later' doesn't become the 'someday' that is typical of you when you get difficult questions.