The fact that the DA sees the police as more important than those people who are not police is really fucked up, regardless of any other biases and prejudices they might have. And this disgusting relationship causes issues in lots of manners. This includes:

• It means that an action against a police officer (including many things that are not criminal) is treated much more harshly, often in a retaliatory manner rather than merely upholding justice and maintaining the peace while crimes against others are often ignored. And it's not uncommon for someone to have great injustices done to them because too many police officers take a person asserting their basic rights as a personal affront.
• when police commit crimes their actions are routinely ignored or just given extremely gentle treatment.
• The DA and police often see each other as partners in attempting to get convictions for the DA rather than the true job of the investigatory role of police which is to investigate potential crimes in an unbiased manner. And while it is a criminal action for a DA to withhold exculpatory evidence, this "partnership" routinely sees police turning a blind eye towards evidence in favor of the accused and so the DA never has it in their possession to withhold.