And I would disagree with that speculation. Very much so. And dont really know of anything that supports it...that cops just spray and pray, or just keep blasting away.
You found nothing that supports bystanders are being harmed (altho of course there are some cases) but certainly did find data that supports police needing more rounds: the miss rate while under stress/shooting at moving targets/multiple targets/targets that almost always require more than one shot to stop them.
Try reading the FBI Files and other accounts of gunfights. Trained officers still require multiple shots to stop attacks...and few if any records of collateral damage.