I’ve investigated three cases where that happened . Actually the perp’s weapon was a gun in two cases and a knife in the third. Bullets through the hand in each case.
It wasn’t intentional but rather the product of a breakdown in training. The officers’ eyes were fixed on the threat, the weapon. That’s where the bullets went. In fairness, in one case the perp was firing through the windshield of his car and the only part of him visible was his face and the gun hand directly in front of it.
That case and the knife were fatal. Two of the three officers who fired at the guy with the knife aimed center mass. In the third case the perp was drawing the weapon from the front of his waistband. Three rounds from two guns in about a 6” group, right in the family jewels. He didn’t die, just wished he did.
I went through the FBI Citizen’s Academy. During shoot/don’t shoot drills with paint projectile weapons I shot the bad guy right in the trigger finger. I had total tunnel vision.