The issue isn't QI in and of itself -- as others have said, it serves a useful purpose in protecting the personal liability of government agents acting out their official duties, which can be reasonable (one example was that a planning board member shouldn't face personal liability for denying a proposal). In my mind, there are two issues (one direct, one indirect) with QI and policing specifically:

- QI has been defined as so broadly covering the police that any situation that hasn't explicitly already been defined as an overreach or overreaction will be considered as covered by QI, so officers face little to no personal accountability.

- Police and civilian oversight boards are largely ineffective at doling out substantial punishments, so officers face little to no professional accountability. Such oversight is typically fought, and fought hard, by police unions.

As a result of this, police officers face little pushback for misbehavior, or even patterns of misbehavior. Court decisions narrowing the scope of QI as it applies to police officers (eg: any behavior by a police officer that's not "by the book" would not be considered eligible for QI) would go a long way towards providing accountability.