But all those have recourse. They can sue the state and get restitution. So, yes, mistakes happen, but there is procedure to seek corrective action. There is a difference.

The only way to not investigate innocent people would be to know in advance who's guilty. And if you knew who was guilty in advance why even have courts? It'd be for show. Anyhow, that's be asking for more than we are capable of as a civilization. It's understood innocent people will be accused and acquitted thru the system; if the state is proven wrong and you suffered from the process, there is recourse. You sue the state.

How do you sue vigilantes who are by definition, outside the system?