Having that badge should cause you to be held to a higher level of accountability. Abusing the power given to you by being an officer should mean receiving much more severe consequences.
For instance, the judge who refused involuntary commitment for the schizophrenic who killed the woman in Charlotte could be held accountable for their bad judgment.
Judges face almost no consequences for their decisions, and so they think it is right and proper that police should have qualified immunity from similar consequences.
That's not trouble, it's a strong selling point. No public official should be immune from accountability for their crimes. Transparency and accountability would solve a lot of problems. Any public official uncomfortable with the idea of not being able to commit crimes and civil rights violations with impunity isn't fit for the job they have.
There's an argument it might effect prosecutorial immunity, presuming someone was a stickler about consistency, but it's tough to say because the justifications are arguably based on a poor historical understanding of how prosecutors took up cases. (Historically prosecutors, even criminal prosecutors, were often private individuals paid by the local government to prosecute a case, or even prosecute a case entirely on their own volition. But today many jurists just assume the prosecutor has always and only been a distinct executive office, which if they're well read enough--but not too well read--might think sometimes had some quirks about who filled the office.)