Some people have a persecution complex where they think people are out to get them and they see conspiracy everywhere. Some people are just reasonably suspicious of unusual coincidences. My general of thumb for judging any conspiracy theory is the fact that it's extremely difficult to maintain a conspiracy with more than a dozen people involved. So whenever somebody says that the infamous "they" are doing this or that, ask yourself: 'How many people would have to be in on it to pull this off?'