It is my view that the gist of the Star Wars movies is that both internally to the individual and among the group, there is a tension between good and bad, between darkness and light. We all have the capability to do evil to each other, to be inhumane to one another, if we allow ourselves to be ruled by our instincts.
The virtuous one is self aware and recognizes the emergent feelings of anger/hatred and exercises self control, so as to continue to let the light shine and over power the darkness. It is through this self awareness, discipline, and control that the individual can achieve virtue.
The force is a metaphor for this tension, between good and evil (in my mind, I think of a yin-yang symbol as I type this). Ultimately, those who succumb to their own emotions and do not use reason and judgment to control their instincts will fall to the dark side. Those who are self aware, and exercise reason and judgment to control their actions (mitigating 'id' or instinct) will prevail; the path to freedom is virtue.