What I love about conspiracy theorists is that it's an all or nothing thing. They believe every crackpot theory going without argument. I bet if I had the time or inclination to put together a YouTube video claiming the earth was flat I would have Brunswick and The Truth as followers within hours.
The Mail/Express are going to be raking up Madeleine / Diana stories for the next 100 years because it appeals to their readership. The fact that it's all bullshit doesn't matter as long as the "chattering classes" get their fix. Something to discuss at their pilates mornings.