Believing is one thing. Anyone who changes their behavior because of polls, I wanna meet this fucking idiot and find out what's going on in that dumb brain
The 2016 polls were not inaccurate though. They said Trump had a small chance at victory, and he pulled it off. They never said it was impossible, they just said smart money was on Hillary.
The national polling was also pretty accurate, it was the state polling that missed. Trump squeezed out wins in 4 states by a combined total of 50,000 votes. Nationally though the numbers were within their prediction.