Government opinions - the best money can buy. Why, look what they told us about Global Warming. /s
I'm pretty sure the Feds have known everything about Sasquatch for decades, but for reasons ranging from lawsuits over missing persons cases to national security considerations (if the Navy can use dolphins, what could a Marine Force Recon unit do with a Sasquatch?) they have decided we don't need to know.
There is too far much mundane, "boring" evidence and far too many sightings by rational, level-headed people. They won't be able to hide behind the ridiculing of witnesses forever.
A path-breaking researcher (David Paulides) has reported on a pattern of mysterious disappearances in the national forests that the feds doggedly minimize and cover up. Attacks by Bigfoot are one plausible explanation.