@Fil Albuquerque,
The bottom line I derived from the article was: there are situations (like hearing something that sounds like a predator) where it's best to err on the belief side rather than on the doubt side of mental processes -- I suppose you will agree that every human mind has both the innate capacities to believe and to doubt -- because that allows you to make a
clear and rapid choice. Doubters can procrastinate, even when the best line of action is rationally obvious.
In my mind, that goes well beyond evolutionary genetics. We all have to make fateful choices once in a while: take a job (or not), marry a girl/boyfriend (or not), procreate (or not)... Not all these choices end up right perhaps, but we'd better keep making choices. Even not making choice is a choice, in any case, so we have no choice but make choices. And sometimes it's just a bet, as Frank says, and sometimes it's stuff that people are genuinly motivated to do. And more often than not, they are motivated because they believe in it, they believe it will work out. And they try to love someone for a few decades, which is a frequent aspiration probably entirely based on illusion. Or they try to be a rock star. And if they fail, they try again, and again until maybe they stop believing in it. But there's no doubt beliefs (political, religious, personal) are powerful and long-term motivators.
Now, motivation or persistence (or commitment) are not always a bad thing to have... What great feat can be achieved without them? What great work of art was ever achieved by a person who doesn't believe in art? Would skeptics have built Venice, where it stands? Would doubters have done the French or American revolutions?
At a higher, systemic level, it's all a Darwinian game: whether it's the economy, or science, or nature: new stuff needs to be tried all the time by individuals for the whole system to work. And they will be many losers and few winners... but we all, from the flower to the tiger to the scientist to the business man to the kid with a garage band, we all keep trying, caught in the illusion (perhaps, but a fruitful, productive one, overall) that it will work out just fine.