I agree that ‘under the cover of authority’ is a serious component of this crime. I don’t agree that a life sentence is called for.
Rape can ruin a life. IMHO it’s the worst crime you can commit against another person after murder. And there is no such thing as “I didn’t mean to” as there can be in killing someone. Given that, I’m all for 30 year sentences on forcible rape even without any extra modifiers. Add doing it under the color of authority, and I don’t mind the term going much higher.