Response to Film: What do Nurse Ratchet and RPM represent? How about their conflict?

In One Flew Over The Cuckoo's Nest Nurse Ratchet and R. P. McMurphy juxtapose each other, resulting in conflict throughout the story.
Nurse Ratchet is the embodiment of the phrase  "calm and collected." Her aura is icy and her actions are calculated. Nurse Ratchet represents the oppression  of society. OFOTCN toys with the meaning of insanity and often compares committed patients in the mental institution to the average asshole on the street.According to OFOTCN the difference between sanity and insanity is how a person measures up. It is up to the group who decides who is sane and who is not. Nurse Ratchet represents society deciding who is sane and who is not; she is the ultimate authority. 
RPM is boisterous, animated and flippant. The question is: is RPM actually insane or is he a fantastic fake avoiding his sentence? RPM stands for gambling, prostitution, theft, drinking and all manner of profanity. 
RPM is the subject of speculation for insanity; he represents those under scrutiny, the "insane". 
Nurse Ratchet, being in complete control of the ward is the one who decides if RPM is crazy or not. Her group therapy sessions carried out under the premises that the group can help the guy by   showing him where he's out of place, target individuals by exposing weakness to peers turning members against each other while fueling her fire. Because RPM challenges her authority and refuses to conform to her ideals of an insane society she strives to make his life hell. 
Their conflict is the clash of personalities, the controlling manipulative Nurse Ratchet or the wild rebellious RPM.