Because we want something to be true, we often press to believe it despite no evidence whatsoever. Even when the evidence is in contrast of our hopes, wants and needs, we sometimes hold to the more convenient falsehood.
Better to appreciate reality in the thoughts and actions we will move forward with than simply believe what is most comfortable for us in the moment. Time is wasted and opportunities for growth are voided without evidence to resolve a problem or to overcome a challenge. Even when a number of others believe similarly to you, that does not make it to be of evidence.
Lead and follow rationally, not emotionally.
“The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd.” — Bertrand Russell —