[ekianjo]

You didn't say proof but you said it's better than guessing, and I don't agree with you at all. What if there is a correlation between Vegetarian-lifestyle and Serial-killers ? Does it tell you that it's better than guessing ? Do you even question if the association/correlation makes remote sense ? Is there any underlying mechanism of action that would remotely explain rationally why this correlation could be linked to any real causation phenomenon ?

Correlation is useless, and there's a ton of observational studies out there finding correlations every single day for which we have no rational explanation at all. Observational studies are full of variations in the way they are designed, the way they are reported and the subjects of the studies, it's rather a miracle if you actually detect a hint of causation based on the garbage noise that you get.