1/3 of gullible Americans believe the Warren Report got it right
This 1/3 of Americans are not gullible, just skeptical. Gullible is readily accepting a proposed Large-Secret-Enduring Conspiracy as the truth.
Large numbers of Americans are prone to accepting Large-Secret-Enduring conspiracy theories. Just look at the tens of millions who accept the 2020-Stolen-Election-from-Trump claims.