People are all different, so the reasons for them believing in conspiracies cover a broad range of factors. In general, though, people tend to believe in conspiracies because of helplessness.I found that belief in conspiracy theories is strongly linked to insecurity about employment, alienation, lack of interpersonal trust, and minority status ...
One single thing to remember,which is fact...We are not told everything,whether it's because there would be a global outrage or it's in their own interest.
The most stupid thing is to believe everything you're served with..so a little dose of skepticism is always justified.
Whilst 80% of these theories are complete bullshit,there's this 20% which has probably some kind of truth in it.