oh dear. i'm not a great believer in conspiracy theories, at least, not in the sense of "they're out to get me". feste-fenris is right - an awful lot of what conspiracy theorists would have us believe we should be quaking in our boots about is down to incompetence
freemasons and secret societies - i very much doubt they're really out for world domination. after all, the paths to world domination are well trodden and obvious. perhaps the real purpose of conspiracy theories is to encourage you to look away from the REAL sources of power and domination and the real problems in this world - hunger, all the "isms", environmental disaster and pollution, violence, reliance on drugs... i'm sure you can fill in the rest.
conspiracy theories, then, may be about "why don't you worry about this instead of the real worries?", i.e. don't stick your neck out, keep quiet. divide and conquer? let's face it - most people in power couldn't give a toss about ordinary people, as long as they vote at the right times.