text: Absolutely no one is completely free of bias, and a single opinion from someone might not always be the most honest one. Bias matters; if your friend said your haircut was nice just to be polite, you have the potential to be walking around with a really bad hairstyle. Or, if a friend told you to vote for a candidate just because they like them, you could end up voting for someone who doesn't fit your criteria. You always want to get advice from someone else, to steer clear of dishonest opinions. In conclusion, multiple opinions give you a higher possibility of eliminating bias, because there's always a chance that the next person will be more honest than the first.