Mass shooting in the middle school Vladislav Ribnikar in Belgrade

[Thumpalumpacus]

"He might have a bias." is not a valid argument to reject a scientific study. You need to prove that he has a bias by doing a better study.

Right, which is why you don't settle for the first "study"/opinion piece coming down the pike as having anything but tentative conclusions. And that doesn't address the other problems. The bottom line is that accepting the only study of a field as more accurate simply because no others have yet been done is idiotic. It's assuming the study is correct in its conclusions, and as we know, or should know as you apparently do not, the onus of evidence is on the claimant.