And that's my point. The coverup is almost always worse than the ugly truth. Policing requires community buy in, if you stop releasing info the public wants, you lose the ability to police effectively.
Some of the five charged officers are members of the Scorpion unit, which is supposed to be an elite specialized anti-gang unit. The issue you see with a lot of these units (CRASH in LA, the antigun taskforce in Baltimore, etc) is that they seek out and reward aggressive candidates. There also tends to be a focus on stats and quantifiable metrics (how many arrests, how much cash seized, drugs seized, etc). These are obviously logical incentives, but if not careful you run into the issue of where an officer will be like, oh shit, Steve is 10 arrests ahead of me, I need to make up that gap so I get a promotion. It's the same issue you saw in the Vietnam War with body counts, it gives an incentive to inflate it if that's your metric of success.
Edit: There is also the trap of there is pressure for the unit to improve its performance every month, which is obviously impossible.