It's not that conspiracy theories aren't possible or don't happen to a certain extent. The problem with them and the internet is like playing the game telephone.
Most of you younger dudes won't know what that is but it was a game where you would sit in a circle with a lot of people, let's say 20 or more. Then one person would whisper a secret to one person in the circle.
That person would then whisper the secret to the person to their right and allow that person to tell the next person and so on.
By the time the secret would get to the last person, it would never resemble what the original secret was.
That's kind of what conspiracy theories are, half truths to possible cover ups but by the time idiots on the internet get a hold of them, they are something way different than what happened.
Anyone who believes 9/11 was an inside job is gullible and not very intelligent.