My disenchantment with conspiracy theory came when I actually tried to conspire. It's harder than it looks, particularly over time.
Excellent point.
As they say, three people can keep a secret if two of them are dead.
Most of the conspiracy theories out there require the willing and carefully organized efforts of hundreds or thousands of people, all of whom keep the secret, in many cases for decades or even centuries.
Not something on which a wise person would bet a large sum of money.