I guess I'm missing something here. What is the difference between a violent armed individual trying to use lethal force against a LEO vs. the same violent armed individual trying to use lethal force against a civilian? I don't see that it matters if it's a LEO or a non-LEO defending themselves, the suspect's anatomy doesn't change. The mechanics involved in wound ballistics doesn't change.
I understand the argument for those who can not conceal anything larger, or due to injury can not effectively shoot anything larger. But human anatomy is human anatomy, no matter who the defender is.