I'm not saying the scientists are wrong, I'm just saying that they can plant their words carefully so as to remain politically correct.
Consider this. If a scientist discovered evidence supporting the notion that blacks are genetically predisposed to be violent, do you think people would look at it objectively and welcome the new information, as if it were just any other scientific theory? Nope. Political correctness says you can't form a hypothesis on that kind of evidence unless you have absolute proof. So unless there is absolute proof, you will never hear of what might be pretty convincing evidence.