Why would you think that? I'm assuming the sort of police training we're talking about is "if you're faced with this situation, you should do..." The most famous case of police misconduct in recent history is George Floyd, and I don't think it's controversial to say the responding officers just didn't know what they were supposed to be doing in that situation, did the wrong thing, and it resulted in a death. Better training would definitely have alleviated that situation - it definitely wouldn't have made it worse.
The purpose of police training is to indoctrinate recruits into police culture.
https://twitter.com/KatieSponsler/status/1619341593827487744
> I don't think it's controversial to say the responding officers just didn't know what they were supposed to be doing in that situation, did the wrong thing
I think if you polled 100 police officers, you'd find that that is a very controversial issue, and that many of them support Chauvin's actions. They even had an officer testify that his actions were justified at his trial.
Take the Tyre Nichols incident for example. The arresting officers failed to employ several fundamental tactics that would have resulted in a better outcome.
https://web.archive.org/web/20220128201854/https://www.washi...
If the police are doing the wrong thing, then they need to be taught how to do the right thing. Cops have a lot of extra scrutiny and protocols than moat other professions, and they obviously want to avoid ending up in jail. Good training should teach the correct way to react to situations, and then actually put them through those situations
Even something simple like "how to cuff someome who is resisting without using nonlethal weapons" would have helped a ton. This is a task that you actually need to practice rather than just read about in a book