I am a big proponent of a healthy scepticism to the news we are fed and so, I probably appreciate conspiracy theories more than most... I also think they serve a good purpose for most in that they, purposely or not, properly test the evidence upon which the official story rests
for example, there was no greater fantastical piece of rubbish in my mind than the magic bullet theory of a zigzagging bullet which caused 7 wounds, went thru two people, supposedly stopped in mid air and then just fell out of Connelly on a hospital stretcher in pristine condition... but when you see computer simulations of the shot from the 6th floor taking into account JFK's position leaning on the car window sill, Connelly lower and closer to the centre of the car, you see there was no zigzagging, and similar bullet tests show that the same type of bullet will do similar damage and come out looking in a similar pristine manner