Most jobs are honest enough, but there are plenty of dishonest ones that people do for the money and not because they think it's right.
I'll bet those people I mentioned who post videos like Alex Jones and only get 10 views, some of them believe it. But they're dull and aren't making money off it. Also plenty of people have a few fringe views and theories, but they aren't claiming something far-fetched every time something happens.
Being successful and wrong doesn't make someone a liar. History books are full of people who were earnestly wrong. There's no way this guy spent 30 years playing a character without once slipping up in any aspect of his personal or professional life. He is not a savant method actor. He's a conspiracy theorist.