I humbly suggest that if you give this some thought, you'll see that isn't a very good answer. Any complex system, especially one that involves humans, will have errors. There's no way around that. So the only way to eliminate errors completely is to eliminate the system entirely. This understanding is perhaps what fuels the call for police abolition: No amount of reform and training will get the error rate to zero, so the only way to get zero police accidents is to not have any police.
To illustrate my point further, consider medical malpractice. How many deaths caused by doctor error is acceptable? If the answer is zero, one needs to abolish medicine. How many automobile accidents are acceptable? If zero, we must abolish all motorized transport. I think for the most part people accept the unfortunate fact that accidents are an inevitable part of any system, and should be accepted if we consider the system to do more good than harm.