"How is that conspiracy"
All this kind of stuff is grist for the conspiracy mills.
Yup.
I have found in actually looking into most of these conspiracies that they tend to share at least two things in common.
1) Logical fallacies.
Flawed logic and lots of it. Find a good website that lists logical fallacies, and then look at that side-by-side with these theories. You will recognise the flawed thinking pretty quickly for what it is.
2) Lack of scientific knowledge
Most of these things depend on half-assed science. The more one actually understands about science and physics the more obvious the bull**** is. "Faked" moon landing theories are a good example. See badastronomy.com for a good listing.