Yes, but just because there's many sources to look at doesn't mean that it is impossible to find the truth or at least know to a certain degree. Many people now days are rather ignorant of evidence and are looking for all sorts of totally crazy explanations. Don't get me wrong, we can be deceived and that does legitimatly happen, but we can also be deceived to believe conspiracy theories that are false...
Well Prince Harry believed his mother faked her own death to escape her miserable life. He was only 12 at the time.
He wasn't in the tunnel with her when her car crashed, so fair enough. Some just believe what they want to believe.
Have you read the Curious Incident of the Dog in the night-time?
Some people love a good murder mystery. Well scratch that, most people try and solve mysteries. Some even consult psychics. Unless you were there at the time, you can't truly know, even if the body is right in front of you and you do forensics. Even the bodyguard who survived the crash couldn't remember what happened at the time of Diana's death.
I'm just using that as an example, its been throughly investigated, and the conclusion is it was an unfortunate accident, there was evidence the driver was drunk/drugged, or DIU. There is also evidence of another car taking a wrong turn at the tunnel and the driver swerving to miss it at speed. But at the time, it was all pinned on the paparazzi, who were constantly chasing Diana for a picture. Which was true.
9-11 the motives aren't easily explained, but if you know history, aggressions by the US in Arab countries go back a long way.