I love a good conspiracy too Aussie Bob, and believe the inquisitive nature of some parts of society play a role in keeping governments in check. However in my experience conspiracy minded people apply very little critical thinking to their opinions, often believing a hundred different things just because they presented as "conspiracy theories".
There are some I believe are possible or even likely: Gulf of Tonkin, WMD intel being deliberately falsified, 9/11 being 'allowed' to happen, etc. Some I don't believe: fake moon landing, 9/11 being an 'inside job'. I guess I'm just smug in my own opinions...
The NSA revelations are certainty interesting because they showed a massive operation can be kept secret for some time, but maybe not indefinitely.
Also, I note a lot of chemtrailers don't believe the mainstream climate change theories, so should get along well with many on Pprune. (as I troll as hard as Compy)