It depends, people who 'believe' less in stuff , they are actually smarter than the believers because of course most startups go to zero and if somebody is naiv

It depends, people who 'believe' less in stuff , they are actually smarter than the believers because of course most startups go to zero and if somebody is naive then there are higher chances that they won't be as bright as a depressive realist. So you might counterintuitively actually end up ahead by hiring the person who doesn't believe in the company, because they'd work less and with less enthusiasm but the quality of the work might be better because they are as a person better than the naive believer.