If you "dredge" any data set (even the one you can 100% trust) over and over with random hypotheses until p-value is <0.05, you will eventually (actually, pretty quickly) support some false hypothesis. That's why "data dredging" is also p-hacking.
Yes, as I understand it there is bias inherent in any dataset due to the fact it is a sample. Data dredging is just looking for that bias. You could do that, but then you'd have to confirm with a new experiment.
