It's not that everyone believes they aren't real, just the ones that leaves those comments. If you have 3 people saying its fake...it takes some courage for someone to stand up and voice their opposite opinion. Most people feel it's not worth the argument, or maybe they will appear silly in the eyes of others.
I personally don't think they are real (blood sucking vampires with supernatural powers, and human that turn werewolf on the full moon) at least not in the terms in which I've seen and heard about them (books and television). But who knows maybe they are. There's people that don't believe in fairies, ghost, demons, Gods, etc....This site has a beautiful mix of people, with a variety of beliefs. Is anyone truly right, or wrong if it works for them? I don't think Bigfoot is real either, because I'd think they'd be more proof of existence besides grainy footage, and blurred photos if they were. But, for those who have seen one, they wouldn't care of my opinion. My rambling point is, we are all here to learn, and to teach. But don't let others point of view solely change yours. There is nothing wrong with believing or not believing.