But isn't the larger differentiator from most other first world countries the way officials are treated regarding the criminal code? I am expecting most countries to have a quite independent prosecuting office that prosecutes both officials and laymen, hopefully to the same degree? (The exception I expect is the military?)
In my locality one of the things I like 'best' is an article in our criminal law that lets a victim ask a judge to reconsider the decision of the prosecution not to press charges. It's one of the final balances in our criminal law.
I suspect that the reason is a very simple worldview that divides everything into good vs evil / us vs them, and therefore cops vs criminals.