The Cause of Religion
Most people are not looking for provable truths. As you said, truth is often accompanied by intense pain, and almost no one is looking for painful truths. What people need is beautiful, comforting stories that make them feel as if their lives have some meaning. Which is where religion comes from.
(From Murakami’s 1Q84 - page 441 - which I am steadily making my way through. This is not a new insight at all, but it is a truth simply expressed.)