The opposite of a conspiracy theorist is a pundit, in the same way as the opposite of a terrorist is a freedom fighter; they are both killers.
If one visits a site devoted to mathematics, only empirical fact will be found. If one visits CNN.com, for example, 90% of the content is nothing but opinion put forward by a panel of pundits. How is this different than a conspiracy site? The only difference is whose side they are on. Much of the time, their facts are just as dubious.