I'm not sure how it happened. One day you're just going along, living your life as normal, and the next you're frothing at the mouth in rage over a Cartoon Network original movie because it violated the very premise of the franchise! Somewhere along the line, I woke up one morning with some very strong opinions about Scooby-Doo. [...]
Which is why the existence of the supernatural just doesn't work within the framework of Scooby-Doo. It wouldn't work even if it were done in such a way that they were discovering the truth that real monsters actually existed against a disbelieving public, which is a premise that's been done really well elsewhere. There's an underlying logic to the world of Scooby-Doo that just boils down to Reason vs. Superstition, and in that battle, superstition can never win.
Scooby-Doo and Secular Humanism