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Of course, people who are informed by propaganda will just say "conspiracy theory" as if it's a pejorative term, ...
It is a pejorative term these days, generally used to refer to explanations involving highly implausible conspiracies rather than merely conspiracies. The term "conspiracy" on its own is common in law and in sober reporting and has no such connotation.
Generally used for the highly implausible? Not really. It's generally used for both the implausible and the probable. Kind of like the word "troll" is used for both the jerk and the entertainer.
@Lagomorph: If the western powers allowed the people of the middle eastern countries to change their own governments to what they wanted without intervention then they would be more than capable of fighting daesh themselves. But so long as daesh is continuously armed, funded, and supported by Saudi Arabia, Israel, Turkey, the U.S., etc., then the people cannot fight daesh themselves.
As far as refugees are concerned, just think if there was a catastrophic natural disaster in Europe. The rest of the world would have to take all the refugees, wouldn't it? Sorry, but the invasion of the Middle East will not be a minor footnote in history. It will forever resist terms such as a mere "mistake", or "folly". It's changing the world, it's changing Europe forever. It's a world war event.