“we don’t know if there were other companies (besides Blackwater) that didn’t get anybody arrested so they didn’t become part of the general consciousness.”
Lots and Lots of people know. You are just fantasizing here. Baselessly. Blackwater did not conduct large combined arms combat operations like Wagner just tried. We had plenty of Marines and Mechanized Infantry units for any such mission - and there were damn few such missions after the initial invasion (Fallujah is the most notable exception).
But those Marines and mechanized unit didn’t allow us to hide the number of casualties. We know for a fact that we supplemented troops for offensives, the “Surge” was supplemented with locals that became the core of ISIS when we stopped giving them things to do. So if somebody is fantasizing here it’s you. Your confidence goes 100% counter to known facts.