You're confusing the scientific rational doubt, and projected, induced, completely irrational and paranoid feeling of doubtful fear and uncertainty that distorts peoples' perception and makes them panic and act irrational, and do and accept things and compromises they otherwise never would. The fear of the dark, if you will. And whether it's government pushing for more control, or pimps/mafia/molesters pushing their victims into submission, the mechanisms are very similar, they always first sell you the fear and then offer the protection from it (if you do as told, of course).

One person's rational doubt is another's paranoid doubt. I thought the original article expressed rational doubt.

Without evidence, I lean towards assuming Snowden's motives are what he says they are. But after all, none of us (I assume) actually know him. He's a person in the news.