Most people believe in God and at one point most people believed the world was flat. At another point most people didn't believe humans could impact the weather and global temperature. Most people in the United States used to believe owning slaves was okay and that women weren't smart enough to vote or able to work / survive in a business environment.
I'm not too impressed with what "most people" think. And in fact, most people think things just because someone else thought it and told them so. Most people are followers.
Most people's opinion has absolutely no value to me. However, their eye witness accounts and actual evidence is something I'm willing to consider. But I rarely take one person's interpretation of the truth as the truth. I require hearing first hand accounts from multiple sources as personal perspectives can be incorrect.
I think the difference between a Conspiracy theorist and a Conspiracy investigator is the amount of skepticism involved. A theorist puts out a theory of a conspiracy. An investigator would be like a scientist, trying to prove it wrong. If you are trying to prove the Conspiracy exists, you are a theorist. If you are trying to poke holes in it, you are being skeptical and you are a true investigator. Just like in science, only the theories that hold up to a bunch of scientists trying to prove it false, are considered fact. Most people who obsess about theories are actually trying to prove them to be true, which is not skeptical inquirery and that is why it is rarely taken seriously.