Conspiracy theorists often speak of "evidence", but I have always had the impression they are just looking for something to believe. Generalising grossly, specially Americans like to believe, but no groups seem to be immune to this.

Now that Christianity isn't all that big anymore in many Western countries, it almost seems conspiracy theories have taken over as beliefs for rallying groups around, like it is hard to live without some belief at all.

Governments will use this to create beliefs around common enemies to unite the population and focus away from real problems. That's not too bad, though, as most governments are not very competent. Still, it seems the USA will invent a new common enemy every time the old enemy has disappeared or isn't believed in anymore, and people will merrily continue believing outsiders are conspiring against them. Very interesting to observe.